| Bacteria | | Actinobacteria [phylum] | Clavibacter michiganensis subsp. michiganensis (bacterial canker of tomato) | Eradicated | | | Bradbury, 1986; CABI/EPPO, 2009; EPPO, 2014 |
| Bacteria | | Actinobacteria [phylum] | Clavibacter michiganensis subsp. sepedonicus (Potato ring rot) | Absent, confirmed by survey | | | EPPO, 2014 |
| Bacteria | | Actinobacteria [phylum] | Dermatophilus congolensis | Reported present or known to be present | | | OIE Handistatus, 2005 |
| Bacteria | | Actinobacteria [phylum] | Mycobacterium avium subspecies paratuberculosis | Reported present or known to be present | | | OIE Handistatus, 2005 |
| Bacteria | | Actinobacteria [phylum] | Mycobacterium bovis | Reported present or known to be present | | | OIE Handistatus, 2005 |
| Bacteria | | Bacteroidetes | Paenibacillus larvae | Present | | | OIE, 2009 |
| Bacteria | | Firmicutes | Bacillus anthracis | Last reported 1970 | | | OIE Handistatus, 2005 |
| Bacteria | | Firmicutes | Mycoplasma capricolum subsp. capripneumoniae | Disease never reported | | | OIE Handistatus, 2005 |
| Bacteria | | Firmicutes | Mycoplasma gallisepticum | Disease not reported | | | OIE Handistatus, 2005 |
| Bacteria | | Firmicutes | Mycoplasma mycoides subsp. mycoides small colony (SC) type | Last reported 1892 | | | OIE Handistatus, 2005 |
| Bacteria | | Proteobacteria | Brucella ovis | Disease never reported | | | OIE Handistatus, 2005 |
| Bacteria | | Proteobacteria | Brucella suis | Disease never reported | | | OIE Handistatus, 2005 |
| Bacteria | | Proteobacteria | Burkholderia caryophylli (bacterial wilt of carnation) | Absent, formerly present | | | EPPO, 2014 |
| Bacteria | | Proteobacteria | Burkholderia pseudomallei | Disease never reported | | | OIE Handistatus, 2005 |
| Bacteria | | Proteobacteria | Campylobacter fetus subsp. venerealis | Reported present or known to be present | | | OIE Handistatus, 2005 |
| Bacteria | | Proteobacteria | Coxiella burnetii | CAB Abstracts data mining | | | OIE Handistatus, 2005 |
| Bacteria | | Proteobacteria | Ehrlichia ruminantium | Disease never reported | | | OIE Handistatus, 2005 |
| Bacteria | | Proteobacteria | Erwinia amylovora (fireblight) | Present, few occurrences | | | EPPO, 2014; van der Zwet, 1996; CABI/EPPO, 2013 |
| Bacteria | | Proteobacteria | Francisella tularensis | Disease not reported | | | OIE Handistatus, 2005 |
| Bacteria | | Proteobacteria | Salmonella abortusovis | Disease not reported | | | OIE, 2009 |
| Bacteria | | Proteobacteria | Salmonella gallinarum | Last reported 1994 | | | OIE Handistatus, 2005 |
| Bacteria | | Proteobacteria | Salmonella pullorum | Disease not reported | | | OIE Handistatus, 2005 |
| Bacteria | | Proteobacteria | Taylorella equigenitalis | Last reported 1982 | | | OIE Handistatus, 2005 |
| Bacteria | | Proteobacteria | Xenohaliotis californiensis | Present, few occurrences | Introduced | | Crosson et al., 2014 |
| Eukaryota | Chromista | Bacillariophyta | Didymosphenia geminata (didymo) | Present | Native | | Cleve, 1896; Metzeltin & Lange-Bertalot, 1995 |
| Eukaryota | Chromista | Oomycota | Aphanomyces astaci | Present | Introduced | Yes | Reynolds, 1988; Matthews & Reynolds, 1992; Demers & Reynolds, 2002 |
| Eukaryota | Chromista | Oomycota | Phytophthora cambivora (root rot of forest trees) | Present | | | Shafizadeh & Kavanagh, 2005; CABI/EPPO, 2013 |
| Eukaryota | Chromista | Oomycota | Phytophthora cinnamomi (Phytophthora dieback) | Restricted distribution | Introduced | | IMI, 1991; Shafizadeh & Kavanagh, 2005; EPPO, 2014 |
| Eukaryota | Chromista | Oomycota | Phytophthora infestans (Phytophthora blight) | Present | | | CMI, 1982 |
| Eukaryota | Chromista | Oomycota | Phytophthora kernoviae | Present, few occurrences | | | EPPO, 2014 |
| Eukaryota | Chromista | Oomycota | Phytophthora lateralis (Port-Orford-cedar root disease) | Present, few occurrences | | | EPPO, 2014; EPPO, 2011; CABI/EPPO, 2012 |
| Eukaryota | Chromista | Oomycota | Phytophthora medicaginis (Phytophthora root rot of lucerne) | Present | | | Shafizadeh & Kavanagh, 2005 |
| Eukaryota | Chromista | Oomycota | Phytophthora ramorum (sudden oak death (SOD)) | Restricted distribution | | | EPPO, 2011; EPPO, 2014; CABI/EPPO, 2013 |
| Eukaryota | Fungi | Ascomycota | Apiognomonia errabunda (anthracnose) | Present | | | Sutton, 1980 |
| Eukaryota | Fungi | Ascomycota | Blumeria graminis (powdery mildew of grasses and cereals) | Present | | | CABI/EPPO, 2004 |
| Eukaryota | Fungi | Ascomycota | Calonectria pseudonaviculata (Buxus blight) | Present | Introduced | Yes | Henricot et al., 2008; CABI/EPPO, 2012; EPPO, 2014 |
| Eukaryota | Fungi | Ascomycota | Ciborinia camelliae (flower blight) | Restricted distribution | | | EPPO, 2014 |
| Eukaryota | Fungi | Ascomycota | Colletotrichum acutatum (black spot of strawberry) | Present, few occurrences | | | EPPO, 2014 |
| Eukaryota | Fungi | Ascomycota | Didymascella thujina (cedar leaf blight) | Widespread | Introduced | Yes | Pethybridge, 1919; Forbes, 1920; Forbes, 1921 |
| Eukaryota | Fungi | Ascomycota | Gremmeniella abietina (Brunchorstia disease) | Absent, confirmed by survey | | | EPPO, 2014 |
| Eukaryota | Fungi | Ascomycota | Hymenoscyphus fraxineus (ash dieback) | Restricted distribution | | | EPPO, 2014; CABI/EPPO, 2013 |
| Eukaryota | Fungi | Ascomycota | Lachnellula willkommii (European larch canker) | Present | | | EPPO, 2014; Muskett & Malone, 1983; UK CAB International, 1989 |
| Eukaryota | Fungi | Ascomycota | Monilinia fructigena (brown rot) | Present | | | CABI/EPPO, 2000; EPPO, 2014 |
| Eukaryota | Fungi | Ascomycota | Ophiostoma novo-ulmi (Dutch elm disease) | Widespread | Introduced | Yes | Brasier & Kirk, 2001 |
| Eukaryota | Fungi | Ascomycota | Ophiostoma ulmi (Dutch elm disease) | Widespread | Introduced | Yes | Brasier, 1991; EPPO, 2014 |
| Eukaryota | Fungi | Ascomycota | Phyllactinia guttata (powdery mildew of hardwood trees) | Present | | | Braun, 1995 |
| Eukaryota | Fungi | Ascomycota | Seiridium cardinale (cypress canker) | Present | Introduced | | Clancy, 1986; McKee, 1972; Faddoul, 1973; EPPO, 2014; CABI/EPPO, 2014 |
| Eukaryota | Fungi | Ascomycota | Sphaeropsis sapinea (Sphaeropsis blight) | Present | | | Sutton, 1980 |
| Eukaryota | Fungi | Basidiomycota | Chrysomyxa rhododendri (European Rhododendron rust) | Present | | | Spaulding, 1961; CABI/EPPO, 2012 |
| Eukaryota | Fungi | Basidiomycota | Cronartium ribicola (white pine blister rust) | Widespread | | | McKay et al., 1951; CABI/EPPO, 2000; EPPO, 2014 |
| Eukaryota | Fungi | Basidiomycota | Heterobasidion annosum | Present | | | |
| Eukaryota | Fungi | Basidiomycota | Heterobasidion annosum sensu lato (Heterobasidion root rot) | Widespread | Native | | CMI, 1980; EPPO, 2014 |
| Eukaryota | Fungi | Basidiomycota | Puccinia buxi | Present | | | BPI (US National Fungus Collections), 2009 |
| Eukaryota | Fungi | Basidiomycota | Puccinia graminis (stem rust of cereals) | Present | | | Prendergast, 1966 |
| Eukaryota | Fungi | Basidiomycota | Puccinia horiana (white rust of chrysanthemum) | Eradicated | | | CABI/EPPO, 2008; EPPO, 2014 |
| Eukaryota | Fungi | Basidiomycota | Urocystis agropyri (flag smut of wheat) | Present | | | IMI, 1991; EPPO, 2014 |
| Eukaryota | Fungi | Basidiomycota | Urocystis agropyri (flag smut of wheat) | Present | | | UK CAB International, 1991; EPPO, 2014 |
| Eukaryota | Fungi | Chytridiomycota | Synchytrium endobioticum (wart disease of potato) | Restricted distribution | | | EPPO, 2014; CABI/EPPO, 2015 |
| Eukaryota | Metazoa | Annelida | Ficopomatus enigmaticus (tubeworm) | Localised | Introduced | | Kilty & Guiry, 1973; Minchin, 2007 |
| Eukaryota | Metazoa | Annelida | Lumbricus terrestris | Present | Introduced | Yes | Gates, 1972 |
| Eukaryota | Metazoa | Arthropoda | Acarapis woodi (honeybee mite) | Present | | | EPPO, 2014; OIE, 2009 |
| Eukaryota | Metazoa | Arthropoda | Adelges piceae (balsam woolly adelgid) | Present | | | CABI/EPPO, 2012 |
| Eukaryota | Metazoa | Arthropoda | Agrotis ipsilon (black cutworm) | Present | | | Karsholt & Razowski, 1996 |
| Eukaryota | Metazoa | Arthropoda | Amphibalanus improvisus (bay barnacle) | Localised | Introduced | Yes | Minchin, 2007; O'Riordan, 1967; Guiry & Guiry, 2011; Minchin & Eno, 2002 |
| Eukaryota | Metazoa | Arthropoda | Austrominius modestus | Widespread | Introduced | Yes | Allen et al., 2006; Baker et al., 1981; Beard, 1957; Crapp, 1973; Crisp & Southward, 1959; Cross & Southgate, 1983; Healy, 1986; Holmes, 1980; Kelleher, 2006; King et al., 1997; Lawson et al., 2004; Little et al., 1988; Little et al., 1992; McGrath & King, 1992; Myers et al., 1978; Myers et al., 1979; Myers et al., 1980; O'Riordan, 1967; O'Riordan, 1992; O'Riordan, 1996; O'Sullivan, 1983; Picton & Costello, 1998; Simkanin et al., 2005; Watson et al., 2005; Wilkinson et al., 1988 |
| Eukaryota | Metazoa | Arthropoda | Bemisia tabaci (tobacco whitefly) | Eradicated | | | CAB European, 1998; EPPO, 2014 |
| Eukaryota | Metazoa | Arthropoda | Blattella germanica (German cockroach) | Present | Introduced | | Encyclopedia of Life, 2015 |
| Eukaryota | Metazoa | Arthropoda | Bombus terrestris (bumble bee) | Present | Native | | Rasmont et al., 2008 |
| Eukaryota | Metazoa | Arthropoda | Cacoecimorpha pronubana (carnation tortrix) | Present | | | EPPO, 2014; CABI/EPPO, 2014 |
| Eukaryota | Metazoa | Arthropoda | Caprella mutica | Present | Introduced | | Cook et al., 2007a |
| Eukaryota | Metazoa | Arthropoda | Carcinus maenas (European shore crab) | Widespread | Native | | Carlton & Cohen, 2003 |
| Eukaryota | Metazoa | Arthropoda | Ceutorhynchus obstrictus (cabbage seed pod weevil) | Present | | | Colonnelli, 2004 |
| Eukaryota | Metazoa | Arthropoda | Chelicorophium curvispinum (Caspian mud shrimp) | Present | Introduced | | Lucy et al., 2004 |
| Eukaryota | Metazoa | Arthropoda | Coccinella septempunctata (seven-spot ladybird) | Present | | | |
| Eukaryota | Metazoa | Arthropoda | Cochliomyia hominivorax (New World screwworm) | Disease never reported | | | OIE, 2009 |
| Eukaryota | Metazoa | Arthropoda | Crocidosema plebejana (cotton tipworm) | Present | Introduced | | Huggins , 1966 |
| Eukaryota | Metazoa | Arthropoda | Ctenarytaina eucalypti (blue gum psyllid) | Present | Introduced | Yes | Hodkinson & White, 1979 |
| Eukaryota | Metazoa | Arthropoda | Dendroctonus micans (great spruce bark beetle) | Absent, confirmed by survey | | | EPPO, 2014 |
| Eukaryota | Metazoa | Arthropoda | Dreyfusia nordmannianae (silver fir adelges) | Present | | | Carter et al., 1987 |
| Eukaryota | Metazoa | Arthropoda | Elatobium abietinum (green spruce aphid) | Widespread | Introduced | | Theobald, 1914; Carter et al., 1987 |
| Eukaryota | Metazoa | Arthropoda | Epiphyas postvittana (light brown apple moth) | Restricted distribution | Introduced | Yes | Porter, 2001; EPPO, 2014 |
| Eukaryota | Metazoa | Arthropoda | Eriocheir sinensis (Chinese mitten crab) | Present | | | Minchin, 2006 |
| Eukaryota | Metazoa | Arthropoda | Eriosoma lanigerum (woolly aphid) | Widespread | | | CIE, 1975 |
| Eukaryota | Metazoa | Arthropoda | Forficula auricularia (European earwig) | Present | Native | | Good, 1982 |
| Eukaryota | Metazoa | Arthropoda | Frankliniella occidentalis (western flower thrips) | Widespread | Introduced | Yes | CABI/EPPO, 1999; EPPO, 2014 |
| Eukaryota | Metazoa | Arthropoda | Gilpinia hercyniae (spruce sawfly) | Absent, confirmed by survey | | | EPPO, 2014 |
| Eukaryota | Metazoa | Arthropoda | Gypsonoma aceriana (poplar twig borer) | Present | Native | | Razowski, 1996 |
| Eukaryota | Metazoa | Arthropoda | Harmonia axyridis (harlequin ladybird) | Present | | | Murchie et al., 2008; EPPO, 2014 |
| Eukaryota | Metazoa | Arthropoda | Hemimysis anomala | Localised | Introduced | Yes | Minchin & Holmes, 2008 |
| Eukaryota | Metazoa | Arthropoda | Hylobius abietis (large pine weevil) | Present | | | Ward, 1988; CABI/EPPO, 2003; EPPO, 2014 |
| Eukaryota | Metazoa | Arthropoda | Hylurgops palliatus (lesser spruce shoot beetle) | Present | Native | | Wood & Bright, 2002 |
| Eukaryota | Metazoa | Arthropoda | Ips cembrae (large larch bark beetle) | Absent, confirmed by survey | | | EPPO, 2014 |
| Eukaryota | Metazoa | Arthropoda | Ips duplicatus (double-spined bark beetle) | Absent, confirmed by survey | | | EPPO, 2014 |
| Eukaryota | Metazoa | Arthropoda | Ips typographus (eight-toothed bark beetle) | Absent, confirmed by survey | | | EPPO, 2014 |
| Eukaryota | Metazoa | Arthropoda | Leptinotarsa decemlineata (Colorado potato beetle) | Absent, intercepted only | | | EPPO, 2014 |
| Eukaryota | Metazoa | Arthropoda | Leucoptera malifoliella (pear leaf blister moth) | Present | | | EPPO, 2014 |
| Eukaryota | Metazoa | Arthropoda | Lilioceris lilii (lily leaf beetle) | Present | | | O'Sullivan, 2013 |
| Eukaryota | Metazoa | Arthropoda | Limnoria lignorum (gribble) | Present | | | Grave & Holmes, 1998; Holmes & Jeal, 1987 |
| Eukaryota | Metazoa | Arthropoda | Limnoria quadripunctata (gribble) | Localised | | | Grave & Holmes, 1998 |
| Eukaryota | Metazoa | Arthropoda | Liriomyza huidobrensis (serpentine leafminer) | Eradicated | Introduced | | CABI/EPPO, 2002; EPPO, 2014 |
| Eukaryota | Metazoa | Arthropoda | Liriomyza trifolii (American serpentine leafminer) | Eradicated | | | CABI/EPPO, 1997; EPPO, 2014 |
| Eukaryota | Metazoa | Arthropoda | Macrosiphum euphorbiae (potato aphid) | Present | Introduced | | CIE, 1984 |
| Eukaryota | Metazoa | Arthropoda | Meligethes aeneus (rape beetle) | Widespread | | | Kirk-Spriggs, 1996; CABI/EPPO, 2001 |
| Eukaryota | Metazoa | Arthropoda | Myicola ostreae | Present | Introduced | Yes | Holmes & Minchin, 1995 |
| Eukaryota | Metazoa | Arthropoda | Mythimna unipuncta (rice armyworm) | Present, few occurrences | Introduced | | Karsholt & Razowski, 1996 |
| Eukaryota | Metazoa | Arthropoda | Mytilicola intestinalis (mussel red worm) | Localised | | | Minchin et al., 1993; Grainger, 1951 |
| Eukaryota | Metazoa | Arthropoda | Mytilicola orientalis (oyster redworm) | Present | Introduced | | Holmes & Minchin, 1995; Grave et al., 1995; Steele & Mulcahy, 2001; Minchin et al., 1993 |
| Eukaryota | Metazoa | Arthropoda | Myzus cerasi (black cherry aphid) | Present | | | NHM |
| Eukaryota | Metazoa | Arthropoda | Myzus persicae (green peach aphid) | Present | | | CIE, 1979 |
| Eukaryota | Metazoa | Arthropoda | Neodiprion sertifer (European pine sawfly) | Present | Native | | Pschorn-Walcher, 1965 |
| Eukaryota | Metazoa | Arthropoda | Noctua pronuba (common yellow underwing moth) | Widespread | | | Heath & Emmet, 1979 |
| Eukaryota | Metazoa | Arthropoda | Ostrinia nubilalis (European maize borer) | Present | | | Haynes, 1989; EPPO, 2014 |
| Eukaryota | Metazoa | Arthropoda | Otiorhynchus sulcatus (vine weevil) | Widespread | | | Schirocki & Hague, 1994b; Lola-Luz et al., 2003; EPPO, 2014 |
| Eukaryota | Metazoa | Arthropoda | Pacifastacus leniusculus (American signal crayfish) | Present | Introduced | | Johnsen & Taugbøl, 2010 |
| Eukaryota | Metazoa | Arthropoda | Palaemon elegans (rock shrimp) | Present | Native | | d'Udekem d'Acoz, 1999 |
| Eukaryota | Metazoa | Arthropoda | Paranthrene tabaniformis (poplar clearwing moth) | Present | | | Lastuvka & Lastuvka, 1995 |
| Eukaryota | Metazoa | Arthropoda | Paratrechina longicornis (crazy ant) | Unconfirmed record | Introduced | Yes | ISSG, 2011 |
| Eukaryota | Metazoa | Arthropoda | Parthenolecanium persicae (peach scale) | Present | | | CIE, 1979 |
| Eukaryota | Metazoa | Arthropoda | Pieris brassicae (large cabbage white) | Widespread | | | Maitland-Emmet et al., 1989; Higgins, 1983; EPPO, 2014 |
| Eukaryota | Metazoa | Arthropoda | Pieris rapae (cabbage white butterfly) | Present | | | CIE, 1952 |
| Eukaryota | Metazoa | Arthropoda | Pineus pini (pine woolly aphid) | Widespread | Native | | NHM, 1984 |
| Eukaryota | Metazoa | Arthropoda | Pissodes castaneus (small banded pine weevil) | Restricted distribution | | | EPPO, 2014 |
| Eukaryota | Metazoa | Arthropoda | Plutella xylostella (diamondback moth) | Present | | | CIE, 1967 |
| Eukaryota | Metazoa | Arthropoda | Rhyacionia buoliana (European pine shoot moth) | Widespread | | | EPPO, 2014 |
| Eukaryota | Metazoa | Arthropoda | Siphoninus phillyreae (ash whitefly) | Present | | | Mound & Halsey, 1978; CABI/EPPO, 2013 |
| Eukaryota | Metazoa | Arthropoda | Sitophilus granarius (grain weevil) | Present | | | Cawley, 2012 |
| Eukaryota | Metazoa | Arthropoda | Tetranychus urticae (two-spotted spider mite) | Present | | | Lola-Luz et al., 2003 |
| Eukaryota | Metazoa | Arthropoda | Thrips palmi (melon thrips) | Absent, confirmed by survey | | | EPPO, 2014 |
| Eukaryota | Metazoa | Arthropoda | Tipula paludosa (European crane fly) | Present | | | Greenan, 1966; Oosterbroek & Theowald, 1992 |
| Eukaryota | Metazoa | Arthropoda | Tomicus piniperda (common pine shoot beetle) | Widespread | | | Browne, 1968 |
| Eukaryota | Metazoa | Arthropoda | Trialeurodes vaporariorum (whitefly, greenhouse) | Present | | | EPPO, 2014 |
| Eukaryota | Metazoa | Arthropoda | Trogoderma granarium (khapra beetle) | Absent, formerly present | | | Banks &, 1977; EPPO, 2014 |
| Eukaryota | Metazoa | Arthropoda | Varroa destructor (Varroa mite) | Present | | | OIE, 2009; Fera, 2010 |
| Eukaryota | Metazoa | Arthropoda | Vespula germanica (German wasp) | Present | Native | | Archer, 1998; Ings & Roberts, 2002 |
| Eukaryota | Metazoa | Arthropoda | Vespula vulgaris (wasp, common) | Present | | | CAB ABSTRACTS Data Mining 2001 |
| Eukaryota | Metazoa | Brachiopoda | Bythotrephes longimanus (spiny waterflea) | Widespread | Native | | Ketelaars & Gille, 1994 |
| Eukaryota | Metazoa | Chordata | Ameiurus melas (black bullhead) | Present | Introduced | | Welcomme, 1988; Froese Pauly, 2004 |
| Eukaryota | Metazoa | Chordata | Ameiurus nebulosus (brown bullhead) | Present | Introduced | | Welcomme, 1988 |
| Eukaryota | Metazoa | Chordata | Bos taurus (cattle) | Present | | | CAB ABSTRACTS Data Mining 2001 |
| Eukaryota | Metazoa | Chordata | Botrylloides violaceus (violet tunicate) | Present | | | Minchin, 2007 |
| Eukaryota | Metazoa | Chordata | Branta canadensis (Canada goose) | Localised | Introduced | | Blair et al., 2000 |
| Eukaryota | Metazoa | Chordata | Branta hutchinsii | Present, few occurrences | Introduced | | Cramp & Simmons, 1977 |
| Eukaryota | Metazoa | Chordata | Cervus elaphus (red deer) | Present | | | CAB ABSTRACTS Data Mining 2001 |
| Eukaryota | Metazoa | Chordata | Cervus nippon (sika) | Localised | Introduced | Yes | Putman, 2009 |
| Eukaryota | Metazoa | Chordata | Columba livia (pigeons) | Present | Native | | ISSG, 2011 |
| Eukaryota | Metazoa | Chordata | Corvus splendens (house crow) | Present, few occurrences | Introduced | | Mullarney et al., 1999; Ryall, 2010a |
| Eukaryota | Metazoa | Chordata | Cygnus olor (mute swan) | Present | Native | | ISSG, 2011 |
| Eukaryota | Metazoa | Chordata | Cyprinus carpio (common carp) | Present | Introduced | | Welcomme, 1988 |
| Eukaryota | Metazoa | Chordata | Esox lucius (pike) | Present | Introduced | | Froese Pauly, 2004; Welcomme, 1988 |
| Eukaryota | Metazoa | Chordata | Lepus europaeus (European hare) | Localised | Introduced | Yes | Reid, 2011; Fraguglione, 1963 |
| Eukaryota | Metazoa | Chordata | Leuciscus leuciscus (common dace) | Restricted distribution | Introduced | Yes | Caffrey et al., 2007; Welcomme, 1988; Went, 1957 |
| Eukaryota | Metazoa | Chordata | Muntiacus reevesi (Reeves' muntjac) | Present, few occurrences | Introduced | | Carden et al., 2011 |
| Eukaryota | Metazoa | Chordata | Mustela erminea (ermine) | Present | Native | | ISSG, 2011 |
| Eukaryota | Metazoa | Chordata | Neovison vison (American mink) | Present | Introduced | Yes | ISSG, 2011 |
| Eukaryota | Metazoa | Chordata | Oncorhynchus mykiss (rainbow trout) | Present | Introduced | | Welcomme, 1988; Froese Pauly, 2004; DAISIE, 2011 |
| Eukaryota | Metazoa | Chordata | Oncorhynchus tshawytscha (chinook salmon) | Present | Introduced | | Froese Pauly, 2004 |
| Eukaryota | Metazoa | Chordata | Ondatra zibethicus (muskrat) | Eradicated | Introduced | | Danell, 1996 |
| Eukaryota | Metazoa | Chordata | Osmerus eperlanus | Present | Native | | Quigley & Flannery, 1996 |
| Eukaryota | Metazoa | Chordata | Ovis aries (sheep) | Present | | | CAB ABSTRACTS Data Mining 2001 |
| Eukaryota | Metazoa | Chordata | Oxyura jamaicensis (ruddy duck) | Present | Introduced | Yes | ISSG, 2011 |
| Eukaryota | Metazoa | Chordata | Perca fluviatilis (perch) | Present | Native | | Fishbase, 2004; DAISIE, 2011 |
| Eukaryota | Metazoa | Chordata | Petromyzon marinus (sea lamprey) | Widespread | Native | | Muus & Dahlström, 1978 |
| Eukaryota | Metazoa | Chordata | Phasianus colchicus (common pheasant) | Present | Introduced | | BirdLife International, 2015a |
| Eukaryota | Metazoa | Chordata | Phoxinus phoxinus (European minnow) | Widespread | Native | | Froese & Pauly, 2008 |
| Eukaryota | Metazoa | Chordata | Poecilia reticulata (guppy) | Present | Introduced | | Froese & Pauly, 2007 |
| Eukaryota | Metazoa | Chordata | Rutilus rutilus (roach) | Widespread | Introduced | Yes | Welcomme, 1988; Froese Pauly, 2004; Kottelat & Freyhof, 2007; Went, 1957; Fitzmaurice, 1981 |
| Eukaryota | Metazoa | Chordata | Salmo salar (Atlantic salmon) | Present | Native | | Muus & Dahlström, 1974; Froese Pauly, 2004 |
| Eukaryota | Metazoa | Chordata | Salmo trutta (sea trout) | Present | Native | | Muus & Dahlström, 1974; Froese Pauly, 2004 |
| Eukaryota | Metazoa | Chordata | Scardinius erythrophthalmus (rudd) | Present | Native | | Froese Pauly, 2004; Muus & Dahlström, 1968 |
| Eukaryota | Metazoa | Chordata | Sciurus carolinensis (grey squirrel) | Present | Introduced | Yes | ISSG, 2011 |
| Eukaryota | Metazoa | Chordata | Squalius cephalus (European chub) | Last reported 2010 | Introduced | | Caffrey et al., 2008 |
| Eukaryota | Metazoa | Chordata | Streptopelia decaocto (Eurasian collared-dove) | Present | Native | | BirdLife International, 2014 |
| Eukaryota | Metazoa | Chordata | Styela clava (Asian tunicate) | Present | Introduced | Yes | ISSG, 2011 |
| Eukaryota | Metazoa | Chordata | Sus scrofa [ISC] (feral pig) | Present, few occurrences | | Yes | McDevitt et al., 2013; IUCN, 2012 |
| Eukaryota | Metazoa | Chordata | Tinca tinca (tench) | Present | Introduced | | FishBase, 2004; DAISIE, 2011 |
| Eukaryota | Metazoa | Chordata | Tyto alba (Barn owl) | Widespread | Native | | Parkin & Knox, 2009 |
| Eukaryota | Metazoa | Chordata | Varanus indicus (ambon lizard) | Present | Introduced | | ISSG, 2011 |
| Eukaryota | Metazoa | Cnidaria | Cordylophora (euryhaline hydroid) | Present | Introduced | Yes | Allman, 1844; Roch, 1924 |
| Eukaryota | Metazoa | Cnidaria | Myxobolus cerebralis (whirling disease agent) | Present | | | Halliday, 1976 |
| Eukaryota | Metazoa | Cnidaria | Pelagia noctiluca (mauve stinger) | Present | Native | Yes | Delap, 1924; Delap & Delap, 1905; Delap & Delap, 1907; Doyle et al., 2008 |
| Eukaryota | Metazoa | Mollusca | Arion vulgaris (Spanish slug) | Present | Introduced | Yes | Anderson, 2010 |
| Eukaryota | Metazoa | Mollusca | Candidula intersecta (wrinkled dune snail) | Present | Introduced | | Anderson, 2005 |
| Eukaryota | Metazoa | Mollusca | Cornu aspersum (common garden snail) | Widespread | Introduced | | Taylor, 1914; Godan, 1983; Kerney, 1999; Kerney & Cameron, 1979; Reichling, 1950 |
| Eukaryota | Metazoa | Mollusca | Crassostrea gigas (Pacific oyster) | Present | Introduced | | Steele & Mulcahy, 1999; McMahon, 2000; Nehring, 2011 |
| Eukaryota | Metazoa | Mollusca | Crassostrea virginica (eastern oyster) | Present | Introduced | | Kennedy et al., 1996 |
| Eukaryota | Metazoa | Mollusca | Crepidula fornicata (American slipper limpet) | Last reported 1982 | Introduced | | Arnold, 1960; Minchin & McGrath, 1995 |
| Eukaryota | Metazoa | Mollusca | Deroceras invadens (tramp slug) | Present | Introduced | Yes | Makings, 1959 |
| Eukaryota | Metazoa | Mollusca | Deroceras laeve (meadow slug) | Present | Native | | Fauna Europea, 2015 |
| Eukaryota | Metazoa | Mollusca | Deroceras reticulatum (grey field slug) | Present | | | Kerney et al., 1979 |
| Eukaryota | Metazoa | Mollusca | Dreissena polymorpha (zebra mussel) | Widespread | Introduced | Yes | McCarthy et al., 1997 |
| Eukaryota | Metazoa | Mollusca | Ensis directus | Widespread | | | Severijns, 2002 |
| Eukaryota | Metazoa | Mollusca | Limax maximus (leopard slug) | Widespread | Native | | Bank et al., 2002g; Scharff, 1891 |
| Eukaryota | Metazoa | Mollusca | Littorina littorea (common periwinkle) | Widespread | Native | | Brawley et al., 2009 |
| Eukaryota | Metazoa | Mollusca | Oxychilus alliarius (garlic snail) | Present | Native | | Kerney et al., 1983 |
| Eukaryota | Metazoa | Mollusca | Pinctada imbricata radiata (rayed pearl oyster) | Present | Introduced | | Holmes et al., 2015 |
| Eukaryota | Metazoa | Mollusca | Ruditapes philippinarum (Japanese carpet shell) | Present | Introduced | | Le Borgne, 1996; Crowe, 2004; Drummond et al., 2006 |
| Eukaryota | Metazoa | Mollusca | Theba pisana (white garden snail) | Present | | | EPPO, 2014; Bank, 2007; Deblock, 1962; Taylor 1906-1914 |
| Eukaryota | Metazoa | Nematoda | Anguillicoloides crassus | Widespread | Introduced | Yes | Evans & Matthews, 1999; Evans et al., 2001 |
| Eukaryota | Metazoa | Nematoda | Aphelenchoides fragariae (strawberry crimp nematode) | Present | | | CABI/EPPO, 2002; EPPO, 2014 |
| Eukaryota | Metazoa | Nematoda | Aphelenchoides ritzemabosi (Chrysanthemum foliar eelworm) | Present | | | CABI/EPPO, 2000; EPPO, 2014 |
| Eukaryota | Metazoa | Nematoda | Ditylenchus destructor (potato tuber nematode) | Present, few occurrences | | | EPPO, 2014; CABI/EPPO, 2013 |
| Eukaryota | Metazoa | Nematoda | Ditylenchus dipsaci (stem and bulb nematode) | Present, few occurrences | | | Anon, 1972; CABI/EPPO, 2009; EPPO, 2014; CIH, 1972 |
| Eukaryota | Metazoa | Nematoda | Globodera pallida (white potato cyst nematode) | Restricted distribution | Introduced | | Riel & Mulder, 1998; CABI/EPPO, 2011; EPPO, 2014 |
| Eukaryota | Metazoa | Nematoda | Globodera rostochiensis (yellow potato cyst nematode) | Restricted distribution | Introduced | Yes | Riel & Mulder, 1998; CABI/EPPO, 2011; EPPO, 2014 |
| Eukaryota | Metazoa | Nematoda | Meloidogyne arenaria (peanut root-knot nematode) | Present | | | CABI/EPPO, 2003 |
| Eukaryota | Metazoa | Nematoda | Trichinella | Disease not reported | | | OIE Handistatus, 2005 |
| Eukaryota | Metazoa | Nematoda | Xiphinema diversicaudatum (dagger nematode) | Restricted distribution | | | Brown & Taylor, 1987; CABI/EPPO, 2001; EPPO, 2014 |
| Eukaryota | Metazoa | Platyhelminthes | Arthurdendyus triangulatus (New Zealand flatworm) | Widespread | Introduced | Yes | Anderson, 1986; Hogan & Dunne, 1996 |
| Eukaryota | Metazoa | Platyhelminthes | Taenia solium | Disease not reported | | | OIE, 2009 |
| Eukaryota | Planctomycetes [kingdom] | | Chlamydophila abortus | Reported present or known to be present | | | OIE Handistatus, 2005 |
| Eukaryota | Planctomycetes [kingdom] | | Chlamydophila psittaci | Present | | | CAB ABSTRACTS Data Mining 2001 |
| Eukaryota | Plantae | Chlorophyta | Codium fragile subsp. tomentosoides | Widespread | Introduced | Yes | Provan et al., 2005; Guiry & Guiry, 2007; Trowbridge, 1999 |
| Eukaryota | Plantae | Phaeophyta | Sargassum muticum (wire weed) | Widespread | Introduced | | Kraan, 2008; Simkanin, 2004 |
| Eukaryota | Plantae | Pteridophyta | Azolla filiculoides (water fern) | Present | Introduced | Yes | Brunker, 1949; EPPO, 2014 |
| Eukaryota | Plantae | Pteridophyta | Cyrtomium falcatum (Japanese holly fern) | Present | Introduced | | Cullinane & Crowley, 1985 |
| Eukaryota | Plantae | Pteridophyta | Pteridium aquilinum (bracken) | Widespread | Native | | Tutin & et al, 1964 |
| Eukaryota | Plantae | Rhodophyta | Polysiphonia brodiei | Widespread | Native | | Maggs & Hommersand, 1993; Morton, 1994 |
| Eukaryota | Plantae | Spermatophyta | Acacia longifolia (golden wattle) | Present, few occurrences | Introduced | | EFSA Panel on Plant Health, 2015 |
| Eukaryota | Plantae | Spermatophyta | Acer platanoides (Norway maple) | Present | Introduced | | |
| Eukaryota | Plantae | Spermatophyta | Acer pseudoplatanus (sycamore) | Present | Introduced | Yes | Cronk & Fuller , 1995 |
| Eukaryota | Plantae | Spermatophyta | Acer rufinerve (grey snake-bark maple) | Present only in captivity/cultivation | Introduced | | BGCI, 2014 |
| Eukaryota | Plantae | Spermatophyta | Achillea millefolium (yarrow) | Present | Native | | USDA-ARS, 2015 |
| Eukaryota | Plantae | Spermatophyta | Agrostis capillaris (common bent) | Present | Native | | Tutin et al., 1980 |
| Eukaryota | Plantae | Spermatophyta | Aira caryophyllea (silver hairgrass) | Present | Native | | USDA-ARS, 2013 |
| Eukaryota | Plantae | Spermatophyta | Alliaria petiolata (garlic mustard) | Present | Native | | Royal Botanic Garden Edinburgh, 2003 |
| Eukaryota | Plantae | Spermatophyta | Alnus glutinosa (European alder) | Present | Native | | |
| Eukaryota | Plantae | Spermatophyta | Alopecurus pratensis (meadow foxtail) | Present | Native | | USDA-ARS, 2015 |
| Eukaryota | Plantae | Spermatophyta | Amaranthus retroflexus (redroot pigweed) | Present | | | Reynolds, 1996 |
| Eukaryota | Plantae | Spermatophyta | Ambrosia artemisiifolia (common ragweed) | Present | Introduced | | Euro+Med, 2016 |
| Eukaryota | Plantae | Spermatophyta | Ambrosia trifida (giant ragweed) | Present | Introduced | | EPPO, 2014; USDA-ARS, 2016; DAISIE, 2016; Euro+Med, 2016 |
| Eukaryota | Plantae | Spermatophyta | Amelanchier lamarckii (snowy mespilus) | Present | Introduced | | Kurtto, 2009 |
| Eukaryota | Plantae | Spermatophyta | Ammophila arenaria (marram grass) | Present | Native | | USDA-ARS, 2015; Euro+Med PlantBase, 2011 |
| Eukaryota | Plantae | Spermatophyta | Anethum graveolens (dill) | Present | Introduced | | DAISIE, 2015 |
| Eukaryota | Plantae | Spermatophyta | Anthemis cotula (dog fennel) | Present | Introduced | | USDA-ARS, 2003 |
| Eukaryota | Plantae | Spermatophyta | Anthoxanthum odoratum (sweet vernal grass) | Present | Native | | USDA-ARS, 2013 |
| Eukaryota | Plantae | Spermatophyta | Arrhenatherum elatius (false oat-grass) | Present | Native | | Tutin et al., 1980 |
| Eukaryota | Plantae | Spermatophyta | Artemisia biennis (biennial wormwood) | Present | Introduced | | Euro+Med PlantBase, 2011 |
| Eukaryota | Plantae | Spermatophyta | Avena fatua (wild oat) | Widespread | | | Holm et al., 1979 |
| Eukaryota | Plantae | Spermatophyta | Brachypodium sylvaticum (slender false brome) | Present | Native | | GBIF, 2009 |
| Eukaryota | Plantae | Spermatophyta | Brassica nigra (black mustard) | Present | Native | | USDA-ARS, 2013 |
| Eukaryota | Plantae | Spermatophyta | Brassica tournefortii (African mustard) | Present | Introduced | | DAISIE, 2015 |
| Eukaryota | Plantae | Spermatophyta | Bromus hordeaceus (soft brome) | Widespread | Native | | GBIF, 2012 |
| Eukaryota | Plantae | Spermatophyta | Bromus madritensis (compact brome) | Present | Introduced | | Royal Botanic Garden Edinburgh, 2004 |
| Eukaryota | Plantae | Spermatophyta | Bromus sterilis (barren brome) | Present | Native | | Royal Botanic Garden Edinburgh, 2004; USDA-ARS, 2004 |
| Eukaryota | Plantae | Spermatophyta | Buddleja davidii (butterfly bush) | Present | | | EPPO, 2014; GBIF, 2009 |
| Eukaryota | Plantae | Spermatophyta | Bunias orientalis (Turkish warty-cabbage) | Present | Introduced | | Clapham et al., 1962; Reynolds, 2002 |
| Eukaryota | Plantae | Spermatophyta | Carpobrotus edulis (hottentot fig) | Present | Introduced | | Royal Botanic Garden Edinburgh, 2008; EPPO, 2014 |
| Eukaryota | Plantae | Spermatophyta | Cirsium arvense (creeping thistle) | Present | Native | | USDA-ARS, 2004 |
| Eukaryota | Plantae | Spermatophyta | Cirsium vulgare (spear thistle) | Present | Native | | USDA-ARS, 2016 |
| Eukaryota | Plantae | Spermatophyta | Clematis vitalba (old man's beard) | Present | Introduced | | Tutin et al., 1964 |
| Eukaryota | Plantae | Spermatophyta | Conium maculatum (poison hemlock) | Present | Native | | USDA-ARS, 2015 |
| Eukaryota | Plantae | Spermatophyta | Convolvulus arvensis (bindweed) | Present | | | Stace, 1972 |
| Eukaryota | Plantae | Spermatophyta | Cornus sericea (redosier dogwood) | Present | Introduced | | EPPO, 2009; Kelly, 1990 |
| Eukaryota | Plantae | Spermatophyta | Cortaderia selloana (pampas grass) | Present | Introduced | | Reynolds, 2002 |
| Eukaryota | Plantae | Spermatophyta | Cotoneaster horizontalis (wall-spray) | Widespread | Introduced | Yes | NOBANIS, 2015 |
| Eukaryota | Plantae | Spermatophyta | Crassula helmsii (Australian swamp stonecrop) | Localised | Introduced | Yes | NOBANIS, 2005; OEPP/EPPO, 2007; Devlin, 2016 |
| Eukaryota | Plantae | Spermatophyta | Crataegus monogyna (hawthorn) | Present | Native | | USDA-ARS, 2007 |
| Eukaryota | Plantae | Spermatophyta | Cupressus sempervirens (Mediterranean cypress) | Present | | | |
| Eukaryota | Plantae | Spermatophyta | Cuscuta epithymum (alfalfa dodder) | Present | Native | | Valentine &, 1972 |
| Eukaryota | Plantae | Spermatophyta | Cynara cardunculus (cardoon) | Present | Introduced | | GBIF, 2016 |
| Eukaryota | Plantae | Spermatophyta | Cynoglossum officinale (hound's tongue) | Present | Native | | USDA-ARS, 2003 |
| Eukaryota | Plantae | Spermatophyta | Cytisus scoparius (Scotch broom) | Widespread | Native | | Heywood & Ball, 1968 |
| Eukaryota | Plantae | Spermatophyta | Dactylis glomerata (cocksfoot) | Present | Native | | USDA-ARS, 2015 |
| Eukaryota | Plantae | Spermatophyta | Danthonia decumbens (heath grass) | Widespread | Native | | USDA-ARS, 2015; Roskov et al., 2015; Byrne, 1997; Fitter et al., 1989 |
| Eukaryota | Plantae | Spermatophyta | Datura stramonium (jimsonweed) | Present | | | Holm et al., 1997 |
| Eukaryota | Plantae | Spermatophyta | Delairea odorata (Cape ivy) | Present | | | EPPO, 2014 |
| Eukaryota | Plantae | Spermatophyta | Descurainia sophia (flixweed) | Present | Introduced | | USDA-ARS, 2016 |
| Eukaryota | Plantae | Spermatophyta | Digitaria ciliaris (southern crabgrass) | Present | Introduced | | DAISIE, 2014 |
| Eukaryota | Plantae | Spermatophyta | Dipsacus fullonum (common teasel) | Present | Native | | USDA-ARS, 2013 |
| Eukaryota | Plantae | Spermatophyta | Echinochloa colona (junglerice) | Present | Introduced | | DAISIE, 2014 |
| Eukaryota | Plantae | Spermatophyta | Echinochloa crus-galli (barnyard grass) | Present | Introduced | | DAISIE, 2014 |
| Eukaryota | Plantae | Spermatophyta | Elodea canadensis (Canadian pondweed) | Widespread | Introduced | | Sculthorpe, 1971; NOBANIS, 2014 |
| Eukaryota | Plantae | Spermatophyta | Elodea nuttallii (Nuttall's waterweed) | Present | Introduced | | NOBANIS, 2010; DAISIE, 2009; EPPO, 2014 |
| Eukaryota | Plantae | Spermatophyta | Elymus repens (quackgrass) | Restricted distribution | | | Holm et al., 1991; EPPO, 2014 |
| Eukaryota | Plantae | Spermatophyta | Epilobium ciliatum (northern willowherb) | Present | Introduced | Yes | Doogue et al., 1985 |
| Eukaryota | Plantae | Spermatophyta | Erigeron karvinskianus (Karwinsky’s fleabane) | Present | Introduced | Yes | DAISIE, 2012; O'Mahony, 2010 |
| Eukaryota | Plantae | Spermatophyta | Erodium cicutarium (common storksbill) | Present | Native | | USDA-ARS, 2013 |
| Eukaryota | Plantae | Spermatophyta | Fallopia convolvulus (black bindweed) | Present | | | Holm et al., 1979; Holm et al., 1991; DAISIE, 2015 |
| Eukaryota | Plantae | Spermatophyta | Fallopia japonica (Japanese knotweed) | Present | Introduced | Yes | Reynolds, 1998; EPPO, 2014 |
| Eukaryota | Plantae | Spermatophyta | Fallopia sachalinensis (giant knotweed) | Widespread | Introduced | Yes | Royal Botanic Garden Edinburgh, 2008; EPPO, 2014 |
| Eukaryota | Plantae | Spermatophyta | Fallopia x bohemica | Present | | Yes | Preston et al., 2002; Bailey et al., 1996; EPPO, 2014 |
| Eukaryota | Plantae | Spermatophyta | Festuca arundinacea (tall fescue) | Present | Native | | eMonocot, 2016 |
| Eukaryota | Plantae | Spermatophyta | Festuca pratensis (meadow fescue) | Present | Native | | GrassWorld, 2016; Euro+Med, 2016 |
| Eukaryota | Plantae | Spermatophyta | Fragaria vesca (wild strawberry) | Present | Native | | Darrow, 1966 |
| Eukaryota | Plantae | Spermatophyta | Frangula alnus (alder buckthorn) | Present | Native | | Tutin et al., 1968 |
| Eukaryota | Plantae | Spermatophyta | Galinsoga parviflora (gallant soldier) | Present | Introduced | | DAISIE, 2014 |
| Eukaryota | Plantae | Spermatophyta | Galinsoga quadriradiata (shaggy soldier) | Present | Introduced | | Kabuce & Priede, 2010 |
| Eukaryota | Plantae | Spermatophyta | Gaultheria shallon (salal) | Present | Introduced | Yes | EPPO, 2014 |
| Eukaryota | Plantae | Spermatophyta | Glechoma hederacea (ground ivy) | Present | Native | | USDA-NRCS, 2013 |
| Eukaryota | Plantae | Spermatophyta | Glyceria declinata (small sweet grass) | Widespread | Native | | USDA-ARS, 2012 |
| Eukaryota | Plantae | Spermatophyta | Glyceria maxima (reed sweet-grass) | Present | Native | | USDA-ARS, 2009 |
| Eukaryota | Plantae | Spermatophyta | Gunnera tinctoria (giant rhubarb) | Localised | Introduced | Yes | Alien Plants in Ireland, 2008; EPPO, 2014 |
| Eukaryota | Plantae | Spermatophyta | Hedera helix (ivy) | Widespread | Native | | Stace, 1997 |
| Eukaryota | Plantae | Spermatophyta | Helianthus tuberosus (Jerusalem artichoke) | Present | | | EPPO, 2014 |
| Eukaryota | Plantae | Spermatophyta | Helminthotheca echioides (bristly oxtongue) | Present | | | DAISIE, 2015; USDA-ARS, 2016; Greuter, 2006 |
| Eukaryota | Plantae | Spermatophyta | Heracleum mantegazzianum (giant hogweed) | Widespread | Introduced | Yes | Tiley et al., 1996; Brummitt, 1968; EPPO, 2014 |
| Eukaryota | Plantae | Spermatophyta | Hirschfeldia incana (shortpod mustard) | Present | Introduced | | USDA-ARS, 2016 |
| Eukaryota | Plantae | Spermatophyta | Holcus lanatus (common velvet grass) | Widespread | Native | | Phillips, 1994; USDA-ARS, 2013 |
| Eukaryota | Plantae | Spermatophyta | Hydrilla verticillata (hydrilla) | Restricted distribution | | | Tutin et al., 1972; Holm et al., 1979; Cook & Lüönd, 1982; EPPO, 2014 |
| Eukaryota | Plantae | Spermatophyta | Hydrocotyle ranunculoides (floating pennywort) | Restricted distribution | Introduced | Yes | Maguire et al., 2008; EPPO, 2013 |
| Eukaryota | Plantae | Spermatophyta | Hyoscyamus niger (black henbane) | Present | Native | | USDA-ARS, 2015 |
| Eukaryota | Plantae | Spermatophyta | Hypericum perforatum (St John's wort) | Present | Native | | USDA-ARS, 2015 |
| Eukaryota | Plantae | Spermatophyta | Hypochaeris radicata (cat's ear) | Present | Native | | USDA-NRCS, 2013 |
| Eukaryota | Plantae | Spermatophyta | Impatiens glandulifera (Himalayan balsam) | Present | Introduced | | EPPO, 2014; Beerling & Perrins, 1993 |
| Eukaryota | Plantae | Spermatophyta | Isatis tinctoria (dyers woad) | Present | Introduced | | Reynolds, 2002 |
| Eukaryota | Plantae | Spermatophyta | Juncus effusus (common rush) | Present | Native | | Kirschner, 2002 |
| Eukaryota | Plantae | Spermatophyta | Juncus planifolius (broadleaf rush) | Localised | Introduced | Yes | National Biodiversity Data Centre, 2012 |
| Eukaryota | Plantae | Spermatophyta | Juncus tenuis (slender rush) | Present | Introduced | | USDA-ARS, 2016 |
| Eukaryota | Plantae | Spermatophyta | Lagarosiphon major (African elodea) | Present | Introduced | | BioChange, 2007; EPPO, 2014 |
| Eukaryota | Plantae | Spermatophyta | Lamium amplexicaule (henbit deadnettle) | Present | Native | | Royal Botanic Garden Edinburgh, 2003 |
| Eukaryota | Plantae | Spermatophyta | Lemna minuta | Present | Introduced | | DAISIE, 2008; Cotton, 1999 |
| Eukaryota | Plantae | Spermatophyta | Lepidium latifolium (perennial pepperweed) | Present | Native | | Royal Botanic Garden Edinburgh, 2012 |
| Eukaryota | Plantae | Spermatophyta | Lepidium perfoliatum (clasping pepperweed) | Present | Introduced | | DAISIE, 2016 |
| Eukaryota | Plantae | Spermatophyta | Leucanthemum vulgare (oxeye daisy) | Present | Native | | USDA-ARS, 2015 |
| Eukaryota | Plantae | Spermatophyta | Ligustrum vulgare (common privet) | Present | Native | | USDA-ARS, 2015 |
| Eukaryota | Plantae | Spermatophyta | Linaria vulgaris (common toadflax) | Present | Native | | USDA-ARS, 2015; USDA-ARS, 2003 |
| Eukaryota | Plantae | Spermatophyta | Lolium perenne (perennial ryegrass) | Present | Native | | eMonocot, 2013 |
| Eukaryota | Plantae | Spermatophyta | Lolium temulentum (darnel) | Present, few occurrences | Introduced | | Curtis et al., 1988 |
| Eukaryota | Plantae | Spermatophyta | Lonicera japonica (Japanese honeysuckle) | Present | Introduced | | DAISIE, 2014 |
| Eukaryota | Plantae | Spermatophyta | Lupinus polyphyllus (garden lupin) | Present | Introduced | | DAISIE, 2016 |
| Eukaryota | Plantae | Spermatophyta | Lysichiton americanus (American skunk cabbage) | Restricted distribution | | | EPPO, 2014; Preston CD Pearman DA Dines TD, 2002; Clement & Foster, 1994; Doyle & Duckett, 1985; O'Malley, 1996 |
| Eukaryota | Plantae | Spermatophyta | Lythrum salicaria (purple loosestrife) | Present | Native | | Wangerin & Schr÷ter, 1937 |
| Eukaryota | Plantae | Spermatophyta | Mahonia aquifolium (Oregongrape) | Present | Introduced | | GBIF, 2010 |
| Eukaryota | Plantae | Spermatophyta | Malva pusilla (round-leaved mallow) | Present | Introduced | | DAISIE, 2014 |
| Eukaryota | Plantae | Spermatophyta | Marrubium vulgare (horehound) | Present | Native | | GBIF, 2013 |
| Eukaryota | Plantae | Spermatophyta | Melilotus albus (honey clover) | Present | Native | | Milbau & Stout, 2006 |
| Eukaryota | Plantae | Spermatophyta | Mentha pulegium (pennyroyal) | Present | | | USDA-ARS, 2013; Datamining 2011 - Invasive Species Databases |
| Eukaryota | Plantae | Spermatophyta | Myriophyllum aquaticum (parrot's feather) | Present | Introduced | | Caffrey, 2006 |
| Eukaryota | Plantae | Spermatophyta | Myriophyllum spicatum (spiked watermilfoil) | Present | Native | | Caffrey, 1982 |
| Eukaryota | Plantae | Spermatophyta | Nasturtium microphyllum (one-row watercress) | Present | Native | | USDA-ARS, 2013 |
| Eukaryota | Plantae | Spermatophyta | Nasturtium officinale (watercress) | Present | Native | | USDA-ARS, 2006 |
| Eukaryota | Plantae | Spermatophyta | Nymphoides peltata (yellow floating-heart) | Present, few occurrences | Introduced | Yes | BioChange, 2007 |
| Eukaryota | Plantae | Spermatophyta | Orobanche minor (common broomrape) | Present | Introduced | | Chater & Webb, 1972 |
| Eukaryota | Plantae | Spermatophyta | Oxalis corniculata (creeping woodsorrel) | Present | Introduced | | Milbau & Stout, 2006 |
| Eukaryota | Plantae | Spermatophyta | Oxalis latifolia (sorrel) | Present | | | Valentine, 1968 |
| Eukaryota | Plantae | Spermatophyta | Parentucellia viscosa (yellow glandweed) | Present | Native | | Biological Records Centre, 2013 |
| Eukaryota | Plantae | Spermatophyta | Pastinaca sativa (parsnip) | Present | Introduced | | Euro+Med PlantBase, 2011 |
| Eukaryota | Plantae | Spermatophyta | Persicaria wallichii (Himalayan knotweed) | Present | Introduced | | GBIF, 2015 |
| Eukaryota | Plantae | Spermatophyta | Phalaris aquatica (bulbous canarygrass) | Present | Introduced | | USDA-ARS, 2015 |
| Eukaryota | Plantae | Spermatophyta | Phleum pratense (timothy grass) | Present | Native | | Kew, 2015 |
| Eukaryota | Plantae | Spermatophyta | Phragmites australis (common reed) | Present | | | Preston & Croft, 1997 |
| Eukaryota | Plantae | Spermatophyta | Physalis peruviana (Cape gooseberry) | Localised | Introduced | | GBIF, 2012 |
| Eukaryota | Plantae | Spermatophyta | Pilosella officinarum (mouse-ear hawkweed) | Present | Native | | Sell & West, 1976; Meusel & JSger, 1992 |
| Eukaryota | Plantae | Spermatophyta | Pinus contorta (lodgepole pine) | Present | Introduced | Yes | Lines, 1957 |
| Eukaryota | Plantae | Spermatophyta | Plantago coronopus (Buck's-horn plantain) | Present | Native | | USDA-ARS, 2012 |
| Eukaryota | Plantae | Spermatophyta | Plantago lanceolata (ribwort plantain) | Present | Native | | USDA-ARS, 2003 |
| Eukaryota | Plantae | Spermatophyta | Plantago major (broad-leaved plantain) | Present | | | Akeroyd & Doogue, 1988; Reynolds, 1990 |
| Eukaryota | Plantae | Spermatophyta | Poa annua (annual meadowgrass) | Widespread | | | Holm et al., 1991; Edmondson, 1980; Clayton et al., 2014 |
| Eukaryota | Plantae | Spermatophyta | Poa compressa (Canada bluegrass) | Present | Native | | Royal Botanic Garden Edinburgh, 2015 |
| Eukaryota | Plantae | Spermatophyta | Poa nemoralis (wood bluegrass) | Present | Native | | Royal Botanic Garden Edinburgh, 2016; USDA-ARS, 2016 |
| Eukaryota | Plantae | Spermatophyta | Poa pratensis (smooth meadow-grass) | Present | Native | | Euro+Med, 2016 |
| Eukaryota | Plantae | Spermatophyta | Polygonum arenastrum (common knotweed) | Present | Native | | GBIF, 2015 |
| Eukaryota | Plantae | Spermatophyta | Polygonum aviculare (prostrate knotweed) | Widespread | | | Mitchell, 1986; Holm et al., 1997 |
| Eukaryota | Plantae | Spermatophyta | Polygonum hydropiper (marsh pepper) | Present | | | Holm et al., 1997 |
| Eukaryota | Plantae | Spermatophyta | Polygonum lapathifolium (pale persicaria) | Widespread | | | TUTIN & ET, 1964 |
| Eukaryota | Plantae | Spermatophyta | Polygonum persicaria (redshank) | Present | Native | Yes | Simmonds, 1946; Royal Botanic Garden Edinburgh, 2003 |
| Eukaryota | Plantae | Spermatophyta | Populus nigra (black poplar) | Present | | | |
| Eukaryota | Plantae | Spermatophyta | Potamogeton crispus (curlyleaf pondweed) | Present | Native | | EUNIS, 2008 |
| Eukaryota | Plantae | Spermatophyta | Prunella vulgaris (self-heal) | Present | Native | | WCSP, 2016 |
| Eukaryota | Plantae | Spermatophyta | Raphanus raphanistrum (wild radish) | Present | | | Chater &, 1981; USDA, 1998 |
| Eukaryota | Plantae | Spermatophyta | Rhamnus cathartica (buckthorn) | Present | Native | | Tutin et al., 1968 |
| Eukaryota | Plantae | Spermatophyta | Rhododendron ponticum (rhododendron) | Widespread | Introduced | Yes | Kelly, 1981; EPPO, 2014 |
| Eukaryota | Plantae | Spermatophyta | Rosa rugosa (rugosa rose) | Present | Introduced | | UK Royal Botanic Garden Edinburgh, 2009; Bruun, 2005 |
| Eukaryota | Plantae | Spermatophyta | Rubus armeniacus (Himalayan blackberry) | Present | Introduced | | Allen, 2003 |
| Eukaryota | Plantae | Spermatophyta | Rubus fruticosus (blackberry) | Present | Native | | Royal Botanic Garden Edinburgh, 2003 |
| Eukaryota | Plantae | Spermatophyta | Rubus parviflorus (thimbleberry) | Present | Introduced | | DAISIE, 2015 |
| Eukaryota | Plantae | Spermatophyta | Rumex acetosella (sheep's sorrel) | Present | Native | | USDA-ARS, 2013 |
| Eukaryota | Plantae | Spermatophyta | Rumex crispus (curled dock) | Present | | | Holm et al., 1979 |
| Eukaryota | Plantae | Spermatophyta | Rumex obtusifolius (broad-leaved dock) | Present | Native | Yes | Holm et al., 1979 |
| Eukaryota | Plantae | Spermatophyta | Salix cinerea (grey sallow) | Present | | | CABI, 2005 |
| Eukaryota | Plantae | Spermatophyta | Salix fragilis (crack willow) | Present | Native | | |
| Eukaryota | Plantae | Spermatophyta | Salsola kali (common saltwort) | Present | Native | | USDA-ARS, 2015 |
| Eukaryota | Plantae | Spermatophyta | Sambucus nigra (elder) | Present | Native | | Royal Botanic Garden Edinburgh, 2003 |
| Eukaryota | Plantae | Spermatophyta | Senecio jacobaea (common ragwort) | Widespread | Native | Yes | Chater & Walters, 1976 |
| Eukaryota | Plantae | Spermatophyta | Senecio vulgaris | Widespread | Native | Yes | Chater & Walters, 1976 |
| Eukaryota | Plantae | Spermatophyta | Silybum marianum (variegated thistle) | Present | Introduced | | USDA-ARS, 2013 |
| Eukaryota | Plantae | Spermatophyta | Sisymbrium irio | Present | Introduced | | USDA-ARS, 2013 |
| Eukaryota | Plantae | Spermatophyta | Solanum nigrum (black nightshade) | Present | | | Holm et al., 1997 |
| Eukaryota | Plantae | Spermatophyta | Solidago canadensis (Canadian goldenrod) | Present | Introduced | Yes | Royal Botanic Garden Edinburgh, 2014; EPPO, 2014; Kabuce & Priede, 2010 |
| Eukaryota | Plantae | Spermatophyta | Solidago gigantea (giant goldenrod) | Present | Introduced | Yes | Royal Botanic Garden Edinburgh, 2003; EPPO, 2014 |
| Eukaryota | Plantae | Spermatophyta | Sonchus arvensis (perennial sowthistle) | Widespread | | | EPPO, 2014 |
| Eukaryota | Plantae | Spermatophyta | Sonchus oleraceus (common sowthistle) | Present | Native | | Boulos, 1976; USDA-ARS, 2014 |
| Eukaryota | Plantae | Spermatophyta | Spartina anglica (common cordgrass) | Widespread | Introduced | Yes | McCorry & Otte, 2000 |
| Eukaryota | Plantae | Spermatophyta | Spergula arvensis (corn spurry) | Widespread | | | Holm et al., 1991; Ratter & Akeroyd, 1993 |
| Eukaryota | Plantae | Spermatophyta | Stachys arvensis (staggerweed) | Present | Introduced | | DAISIE, 2014; Govaerts, 2014; USDA-ARS, 2014 |
| Eukaryota | Plantae | Spermatophyta | Stellaria media (common chickweed) | Widespread | | | Holm et al., 1977; Holm et al., 1991; Chater & Heywood, 1972 |
| Eukaryota | Plantae | Spermatophyta | Tanacetum vulgare (tansy) | Widespread | Native | | Heywood, 1976 |
| Eukaryota | Plantae | Spermatophyta | Taraxacum officinale complex (dandelion) | Present | Introduced | | Hook et al., 1993 |
| Eukaryota | Plantae | Spermatophyta | Thlaspi arvense (field pennycress) | Present | | | Clapham, 1972; Holm et al., 1997; USDA et al., 1998 |
| Eukaryota | Plantae | Spermatophyta | Typha angustifolia (lesser bulrush) | Present | Native | | Chambers et al., 2008 |
| Eukaryota | Plantae | Spermatophyta | Typha latifolia (broadleaf cattail) | Present | Native | | USDA-ARS, 2010 |
| Eukaryota | Plantae | Spermatophyta | Ulex europaeus (gorse) | Widespread | Native | Yes | ILDIS, 2007 |
| Eukaryota | Plantae | Spermatophyta | Urtica dioica (stinging nettle) | Widespread | Native | | USDA-ARS, 2015 |
| Eukaryota | Plantae | Spermatophyta | Urtica urens (annual nettle) | Widespread | | | Holm et al., 1997 |
| Eukaryota | Plantae | Spermatophyta | Verbascum thapsus (common mullein) | Present | Native | | ISSG, 2014 |
| Eukaryota | Plantae | Spermatophyta | Vulpia bromoides (squirreltail fescue) | Present | Native | | USDA-ARS, 2012 |
| Eukaryota | Plantae | Spermatophyta | Vulpia myuros (annual fescue) | Present | Native | | Royal Botanic Garden Edinburgh, 2013 |
| Eukaryota | Plantae | Streptophyta | Campylopus introflexus | Present | Introduced | | Richards, 1963 |
| Eukaryota | Protista | Protozoa | Alexandrium minutum | Localised | | | Hansen et al., 2003 |
| Eukaryota | Protista | Protozoa | Bonamia ostreae | Present | | | Lynch et al., 2014 |
| Eukaryota | Protista | Protozoa | Toxoplasma gondii | Reported present or known to be present | | | OIE Handistatus, 2005 |
| Eukaryota | Protista | Protozoa | Tritrichomonas foetus | Disease not reported | | | OIE Handistatus, 2005 |
| Eukaryota | Protista | Protozoa | Trypanosoma equiperdum | Disease not reported | | | OIE Handistatus, 2005 |
| Eukaryota | Protista | Protozoa | Trypanosoma evansi | Disease never reported | | | OIE Handistatus, 2005 |
| Virus | | | African horse sickness virus | Disease never reported | | | OIE Handistatus, 2005 |
| Virus | | | African swine fever virus | Disease never reported | | | OIE Handistatus, 2005 |
| Virus | | | alcelaphine herpesvirus 1 | Reported present or known to be present | | | OIE Handistatus, 2005 |
| Virus | | | Arterivirus | Reported present or known to be present | | | OIE Handistatus, 2005 |
| Virus | | | avian infectious bronchitis virus | Last reported 1997 | | | OIE Handistatus, 2005 |
| Virus | | | Avipoxvirus | Present | | | OIE Handistatus, 2005 |
| Virus | | | Barley yellow dwarf viruses (barley yellow dwarf) | Present | | | Mercer et al., 1989; EPPO, 2014; CMI, 1969 |
| Virus | | | bluetongue virus | Disease never reported | | | OIE Handistatus, 2005 |
| Virus | | | bovine herpesvirus 1 | Reported present or known to be present | | | OIE Handistatus, 2005 |
| Virus | | | bovine leukemia virus | Last reported 1999 | | | OIE Handistatus, 2005 |
| Virus | | | bovine viral diarrhea virus | Reported present or known to be present | | | OIE Handistatus, 2005 |
| Virus | | | caprine arthritis encephalitis virus | Reported present or known to be present | | | OIE Handistatus, 2005 |
| Virus | | | classical swine fever virus | Last reported 1958 | | | OIE Handistatus, 2005 |
| Virus | | | duck hepatitis A virus | Reported present or known to be present | | | OIE Handistatus, 2005 |
| Virus | | | equine arteritis virus | Disease not reported | | | OIE Handistatus, 2005 |
| Virus | | | equine infectious anaemia virus | Disease never reported | | | OIE Handistatus, 2005 |
| Virus | | | equine influenzavirus | Reported present or known to be present | | | OIE Handistatus, 2005 |
| Virus | | | foot-and-mouth disease virus | Last reported 2001 | | | OIE Handistatus, 2005 |
| Virus | | | Gallid herpesvirus 2 | Reported present or known to be present | | | OIE Handistatus, 2005 |
| Virus | | | infectious bursal disease virus | Reported present or known to be present | | | OIE Handistatus, 2005 |
| Virus | | | infectious haematopoietic necrosis virus | Disease never reported | | | OIE Handistatus, 2005 |
| Virus | | | influenza A virus | Last reported 1983 | | | OIE Handistatus, 2005 |
| Virus | | | Japanese encephalitis virus | Disease never reported | | | OIE Handistatus, 2005 |
| Virus | | | lumpy skin disease virus | Disease never reported | | | OIE Handistatus, 2005 |
| Virus | | | myxoma virus | Reported present or known to be present | | | OIE Handistatus, 2005 |
| Virus | | | Nairobi sheep disease virus | Disease never reported | | | OIE Handistatus, 2005 |
| Virus | | | Pepino mosaic virus | Present, few occurrences | | | EPPO, 2014; CABI/EPPO, 2015 |
| Virus | | | peste des petits ruminants virus | Disease never reported | | | OIE Handistatus, 2005 |
| Virus | | | Potato spindle tuber viroid (spindle tuber of potato) | Absent, formerly present | | | CABI/EPPO, 2014; EPPO, 2014 |
| Virus | | | rabbit hemorrhagic disease virus | Reported present or known to be present | | | OIE Handistatus, 2005 |
| Virus | | | rabies virus | Last reported 1903 | | | OIE Handistatus, 2005 |
| Virus | | | Rift Valley fever virus | Disease never reported | | | OIE Handistatus, 2005 |
| Virus | | | rinderpest virus | Last reported 1866 | | | OIE Handistatus, 2005 |
| Virus | | | spring viraemia of carp virus | Disease never reported | | | OIE Handistatus, 2005 |
| Virus | | | Strawberry vein banding virus (vein banding of strawberry) | Absent, invalid record | | | CABI/EPPO, 2002; EPPO, 2014 |
| Virus | | | Suid herpesvirus 1 | Reported present or known to be present | | | OIE Handistatus, 2005 |
| Virus | | | swine vesicular disease virus | Disease never reported | | | OIE Handistatus, 2005 |
| Virus | | | Taura syndrome virus | No information available | | | OIE Handistatus, 2005 |
| Virus | | | Venezuelan equine encephalitis virus | Disease never reported | | | OIE Handistatus, 2005 |
| Virus | | | vesicular stomatitis virus | Disease never reported | | | OIE Handistatus, 2005 |
| Virus | | | visna/maedi virus | Last reported 1986 | | | OIE Handistatus, 2005 |