Meloidogyne incognita (root-knot nematode)
Index
- Pictures
- Identity
- Taxonomic Tree
- Notes on Taxonomy and Nomenclature
- Description
- Distribution
- Distribution Table
- Risk of Introduction
- Habitat
- Hosts/Species Affected
- Host Plants and Other Plants Affected
- Growth Stages
- Symptoms
- List of Symptoms/Signs
- Biology and Ecology
- Natural enemies
- Notes on Natural Enemies
- Pathway Vectors
- Plant Trade
- Impact
- Diagnosis
- Detection and Inspection
- Similarities to Other Species/Conditions
- Prevention and Control
- References
- Links to Websites
- Distribution Maps
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Top of pageIdentity
Top of pagePreferred Scientific Name
- Meloidogyne incognita (Kofoid & White, 1919) Chitwood 1949
Preferred Common Name
- root-knot nematode
Other Scientific Names
- Meloidogyne acrita Chitwood, 1949
- Meloidogyne incognita acrita Chitwood, 1949
- Meloidogyne wartellei Golden & Birchfield, 1978
- Oxyuris incognita Kofoid & White, 1919
International Common Names
- English: root-knot eelworm; southern root-knot nematode
- Spanish: anguillula de las raices; nemátodo agallador; nemátodo de la raiz; nemátodo de las agallas; nemátodo de los nódulos de las raíces; nemátodo nódulador; nemátodo sureno de quiste (Mexico)
- French: anguillule a noeud de la patate; anguillule des racines; nématode à galles; nématode cécidogène; nématode des galles des racines; nématode des racines
- Portuguese: nematóide das galhas
Local Common Names
- Denmark: rodgalle-nematode
- Germany: knoellchen-aelchen; knoellchen-nematode; suedliches wurzelgallen-aelchen
- Italy: anguillula delle radici; anguillula gallicola delle radici
- Japan: satumaimo-nekobu-sentyu
- Turkey: kok ur nematodu
EPPO code
- MELGIN (Meloidogyne incognita)
Taxonomic Tree
Top of page- Domain: Eukaryota
- Kingdom: Metazoa
- Phylum: Nematoda
- Family: Meloidogynidae
- Genus: Meloidogyne
- Species: Meloidogyne incognita
Notes on Taxonomy and Nomenclature
Top of page Most Meloidogyne species are difficult to identify with certainty due to their inherent variability. Material of both the adult females and the infective juveniles should be examined before coming to a conclusion. Male characters can also be useful in some instances.Description
Top of pageDescription (after Orton Williams, 1973)
Female
Endoparasitic, body spherical with projecting neck. Head with 2 or occasionally 3 annules behind head-cap. Cuticle thickening abruptly at base of relaxed stylet. Stylet knobs rounded or drawn out laterally. Excretory pore at level of or posterior to stylet knobs, 10-20 annules behind head. Posterior cuticular pattern displays bewildering variation. Typical pattern 'incognita type'; with striae closely spaced, very wavy to zig-zag especially dorsally and laterally. Dorsal arch high, rounded. Lateral field not clear, sometimes marked by breaks in striae, broken ends often forked, pattern merging into body striae. 'Acrita type'; with striae smoother, more widely spaced (or with coarse widely spaced striae separated by fine closely spaced striae visible for short distances). Dorsal arch variable, may be flattened at top or trapezoid. Striae often forked along a 'lateral line'. Limits of pattern more or less well-defined. Aberrant patterns occur.
Male
Head not offset, a high truncate cone shape, clearly annulated. Head-cap with stepped outline in lateral view; annule number behind head-cap very variable, usually 1-3 on sublateral head sectors and 1-5 on lateral head sectors. Conus of stylet longer than shaft, stylet knobs prominent, usually of greater width than length, with flat, concave or 'toothed'; anterior margins. Excretory pore at level of posterior end of isthmus with hemizonid usually 0-5 annules anterior. Lateral field with 4 incisures, outer bands areolated, inner band rarely cross-striated except at posterior end. Testes 1 or 2. Tail bluntly rounded, terminus unstriated. Phasmids at cloaca level or just anterior. Spicules slightly curved, gubernaculum crescentic.
Juvenile
Head not offset, truncate cone shape in lateral view, sub-hemispherical in dorso-ventral view. Head-cap wide followed by 2 clear annules on sublateral head sectors (lateral view), 3 annules on lateral head sectors (dorsal or ventral view). Stylet knobs prominent, rounded. Hemizonid 3 annules long just anterior to excretory pore. Lateral field with 4 incisures, outer bands cross striated. Rectum inflated. Tail tapering to subacute terminus, striae coarsening posteriorly.
Measurements (After Whitehead, 1968)
20 females: L = 500-723 (609) µm; width = 331-520 (415) µm; stylet (10) = 13-16 (14) µm; width stylet base (10) = 3-5 (4) µm; dorsal oesophageal gland orifice (8) = 2-4 (3) µm behind stylet base; length median bulb (10) = 37-63 (46) µm; width median bulb (10) = 31-49 (39) µm; length median bulb valves (10) = 13-16 (14) µm; width median bulb valves (10) = 11-13 (12) µm.
14 males: L = 1108-1953 (1583) µm; a = 31.4-55.4 (46.3); length head (13) = 6.8-8.6 (7.9) µm; stylet (13) = 23.0-32.7 (25.0) µm; width stylet base (13) = 4.7-6.8 (5.8) µm; dorsal oesophageal gland orifice (4) = 1.4-2.5 (2.1) µm behind stylet base; b' (12) = 13.8-20.5 (17.4); c (13) = 97-255 (146); length median bulb (12) = 14.4-25.2 (20.0) µm; width median bulb (12) = 8.6-15.8 (11.2) µm; length median bulb valves (12) = 5.8-9.0 (7.2) µm; spicules (length of arc) (12) = 28.8-40.3 (35.2) µm; gubernaculum (7) = 9.4-13.7 (11.2) µm.
25 juveniles: L = 337-403 (371) µm; a = 24.9-31.5 (28.3); b (21) = 2.02-3.14 (2.36); b' (24) = 6.4-8.4 (7.1); length tail = 38-55 (46) µm; d = 4.0-5.6 (4.9); c = 6.9-10.6 (8.1); length body to middle of genital primordium = 212-247 (230) µm; stylet = 9.6-11.7 (10.5) µm; length median bulb (24) = 10.1-12.9 (11.3) µm; width median bulb (24) = 5.8-8.3 (7.3) µm; length median bulb valves (22) = 3.6-6.47 (5.2) µm.
Distribution
Top of page M. incognita has also been recorded from the following areas of protected agriculture; for example, around temperate research stations and other areas of intensive horticulture. In some cases the nematodes have been able to overwinter due to mild winters and could be expanding their geographical range.Armenia (Pogosyan and Karapetyan, 1976), Heilongjiang and Ningxia in China (Yang et al., 1991), Hokkaido in Japan (Yamada and Takakura, 1975), Belarus (Gladkaya, 1981), Estonia (Pallum, 1972), Latvia (Rasina, 1970), Lithuania (Rudzyavichene et al., 1975), Macedonia (Krnjaic, 1977), Moldavia (Batyr and Kozhokaru, 1985), Poland (Brzeski et al., 1978), Romania (Romascu et al., 1974), European part of Russia (Kozhokaru, 1972; Gushchin and Efremenko, 1975; Mar'enko, 1989), Siberia (Shiabova, 1977), Ukraine (Timchenko, 1981) and United Kingdom (IIP, 1991).
Distribution Table
Top of pageThe distribution in this summary table is based on all the information available. When several references are cited, they may give conflicting information on the status. Further details may be available for individual references in the Distribution Table Details section which can be selected by going to Generate Report.
Continent/Country/Region | Distribution | Last Reported | Origin | First Reported | Invasive | Reference | Notes | |
---|---|---|---|---|---|---|---|---|
Asia | ||||||||
Armenia | Present | CABI/EPPO, 2002 | ||||||
Bangladesh | Widespread | Shepherd and Barker, 1990; CABI/EPPO, 2002 | ||||||
Brunei Darussalam | Present | Reddy, 1977; CABI/EPPO, 2002 | ||||||
China | Widespread | CABI/EPPO, 2002 | ||||||
-Anhui | Present | Yang et al., 1991; CABI/EPPO, 2002 | ||||||
-Fujian | Present | Yang et al., 1991; CABI/EPPO, 2002 | ||||||
-Guangdong | Present | Wu and Xue, 1986; CABI/EPPO, 2002 | ||||||
-Guangxi | Present | Wu and Xue, 1986; CABI/EPPO, 2002 | ||||||
-Guizhou | Present | Yang et al., 1991; CABI/EPPO, 2002 | ||||||
-Hainan | Present | Yang et al., 1991; CABI/EPPO, 2002 | ||||||
-Hebei | Present | CABI/EPPO, 2002 | ||||||
-Heilongjiang | Present | CABI/EPPO, 2002 | ||||||
-Henan | Present | Yang et al., 1991; CABI/EPPO, 2002 | ||||||
-Hubei | Present | Yang et al., 1991; CABI/EPPO, 2002 | ||||||
-Hunan | Present | Wu and Xue, 1986; CABI/EPPO, 2002 | ||||||
-Jiangsu | Present | Shen et al., 1990; CABI/EPPO, 2002 | ||||||
-Jiangxi | Present | Yang et al., 1991; CABI/EPPO, 2002 | ||||||
-Nei Menggu | Present | Zhang et al., 1998; CABI/EPPO, 2002 | ||||||
-Qinghai | Present | Yang et al., 1991; CABI/EPPO, 2002 | ||||||
-Shaanxi | Present | Li et al., 1992; CABI/EPPO, 2002 | ||||||
-Shandong | Present | Yang et al., 1991; CABI/EPPO, 2002 | ||||||
-Sichuan | Present | Chen et al., 1991; Yang et al., 1991; CABI/EPPO, 2002 | ||||||
-Yunnan | Present | Yang et al., 1991; CABI/EPPO, 2002 | ||||||
-Zhejiang | Present | Wu and Xue, 1986; CABI/EPPO, 2002 | ||||||
Georgia (Republic of) | Present | CABI/EPPO, 2002 | ||||||
India | Restricted distribution | CABI/EPPO, 2002 | ||||||
-Andaman and Nicobar Islands | Widespread | Salam, 1991; CABI/EPPO, 2002 | ||||||
-Andhra Pradesh | Present | Prasad and, 1986; CABI/EPPO, 2002 | ||||||
-Arunachal Pradesh | Present | CABI/EPPO, 2002 | ||||||
-Assam | Present | Prasad and, 1986; CABI/EPPO, 2002 | ||||||
-Bihar | Present | Prasad and, 1986; CABI/EPPO, 2002 | ||||||
-Chandigarh | Widespread | Mathur and Khera, 1991; CABI/EPPO, 2002 | ||||||
-Chhattisgarh | Present | Sahu et al., 2011 | ||||||
-Delhi | Present | CABI/EPPO, 2002 | ||||||
-Gujarat | Present | Prasad and, 1986; CABI/EPPO, 2002 | ||||||
-Haryana | Present | Haryana, 1980; CABI/EPPO, 2002 | ||||||
-Himachal Pradesh | Restricted distribution | Prasad and, 1986; CABI/EPPO, 2002 | ||||||
-Indian Punjab | Present | Prasad and, 1986; CABI/EPPO, 2002; Harish et al., 2015 | ||||||
-Jammu and Kashmir | Present | Bhat and Kaul, 1994; CABI/EPPO, 2002; Singh and Gupta, 2011 | ||||||
-Karnataka | Present | Prasad and, 1986; CABI/EPPO, 2002 | ||||||
-Kerala | Widespread | Raveendran and Nadakal, 1975; CABI/EPPO, 2002 | ||||||
-Madhya Pradesh | Widespread | Tiwari and Dave, 1985; CABI/EPPO, 2002 | ||||||
-Maharashtra | Present | Prasad and, 1986; CABI/EPPO, 2002 | ||||||
-Manipur | Present | Mishra, 1991; CABI/EPPO, 2002 | ||||||
-Meghalaya | Present | Prasad and, 1986; CABI/EPPO, 2002 | ||||||
-Odisha | Present | Prasad and, 1986; CABI/EPPO, 2002 | ||||||
-Rajasthan | Present | Mathur et al., 1970; CABI/EPPO, 2002 | ||||||
-Sikkim | Present | CABI/EPPO, 2002 | ||||||
-Tamil Nadu | Present | Prasad and, 1986; CABI/EPPO, 2002 | ||||||
-Tripura | Present | CABI/EPPO, 2002 | ||||||
-Uttar Pradesh | Present | Prasad and, 1986; CABI/EPPO, 2002; Anamika, and Sobita, 2010 | ||||||
-Uttarakhand | Present | Rathour et al., 2006 | ||||||
-West Bengal | Widespread | Sen & Das Gupta, 1976; Prasad and, 1986; CABI/EPPO, 2002 | ||||||
Indonesia | Present | CABI/EPPO, 2002 | ||||||
-Java | Widespread | CABI/EPPO, 2002 | ||||||
-Sumatra | Widespread | Bridge, 1978; CABI/EPPO, 2002 | ||||||
Iran | Present | Abivardi & Sharafeh, 1973; CABI/EPPO, 2002; Bahmani et al., 2013 | ||||||
Iraq | Present | Katcho, 1972; CABI/EPPO, 2002 | ||||||
Israel | Widespread | Tarjan, 1953; Orion et al., 1982; CABI/EPPO, 2002 | ||||||
Japan | Present | CABI/EPPO, 2002 | ||||||
-Hokkaido | Present | CABI/EPPO, 2002 | ||||||
-Honshu | Widespread | Saigusa and Matsumoto, 1961; CABI/EPPO, 2002 | ||||||
-Kyushu | Present | Araki and Nakasono, 1987; CABI/EPPO, 2002 | ||||||
-Ryukyu Archipelago | Present | Fukudome, 1978; CABI/EPPO, 2002 | ||||||
-Shikoku | Present | CABI/EPPO, 2002 | ||||||
Jordan | Present | Hashim, 1979; CABI/EPPO, 2002 | ||||||
Kazakhstan | Present | CABI/EPPO, 2002 | ||||||
Korea, Republic of | Present | Shepherd and Barker, 1990; CABI/EPPO, 2002 | ||||||
Lebanon | Widespread | Saad and Tanveer, 1972; CABI/EPPO, 2002 | ||||||
Malaysia | Present | CABI/EPPO, 2002 | ||||||
-Peninsular Malaysia | Present | CABI/EPPO, 2002 | ||||||
-Sabah | Present | Liu, 1977; CABI/EPPO, 2002 | ||||||
-Sarawak | Present | Sarawak, 1975; CABI/EPPO, 2002 | ||||||
Mongolia | Present | CABI/EPPO, 2002 | ||||||
Myanmar | Present | CABI/EPPO, 2002 | ||||||
Nepal | Widespread | Bhardwaj and Hogger, 1984; CABI/EPPO, 2002 | ||||||
Oman | Present | Waller and Bridge, 1978; CABI/EPPO, 2002 | ||||||
Pakistan | Present | Maqbool, 1986; Qureshi et al., 1984; CABI/EPPO, 2002; Hussain et al., 2015 | ||||||
Philippines | Present | Timm, 1965; Madamba, 1981; CABI/EPPO, 2002 | ||||||
Saudi Arabia | Widespread | Eissa and Hyder, 1981; Eissa, 1982; CABI/EPPO, 2002 | ||||||
Singapore | Present | AVA, 2001; CABI/EPPO, 2002 | ||||||
Sri Lanka | Widespread | Sivapalan, 1978; CABI/EPPO, 2002 | ||||||
Syria | Present | CABI/EPPO, 2002 | ||||||
Taiwan | Present | Taylor et al., 1982; CABI/EPPO, 2002 | ||||||
Tajikistan | Present | Dzhuraeva, 1976; Teben'kova, 1987; CABI/EPPO, 2002 | ||||||
Thailand | Present | Chunram, 1972; Shepherd and Barker, 1990; CABI/EPPO, 2002; Ruanpanun and Khun-in, 2015 | ||||||
Turkey | Present | Bora, 1970; CABI/EPPO, 2002 | ||||||
Turkmenistan | Widespread | Artyunov, 1985; Shagalina and Shagalin, 1987; CABI/EPPO, 2002 | ||||||
Uzbekistan | Widespread | Mavlyanov, 1972; Khurramov, 1990; CABI/EPPO, 2002 | ||||||
Vietnam | Widespread | Fam Tkhan' Bin', 1990; Shepherd and Barker, 1990; CABI/EPPO, 2002 | ||||||
Yemen | Widespread | CABI/EPPO, 2002 | ||||||
Africa | ||||||||
Algeria | Present | Scotto, 1961; CABI/EPPO, 2002 | ||||||
Angola | Widespread | CABI/EPPO, 2002 | ||||||
Burkina Faso | Present | CABI/EPPO, 2002 | ||||||
Cameroon | Present | Price, 1994; CABI/EPPO, 2002 | ||||||
Congo Democratic Republic | Widespread | Taylor et al., 1982; CABI/EPPO, 2002 | ||||||
Côte d'Ivoire | Present | Luc & Guiran, 1960; Fortuner, 1981; CABI/EPPO, 2002 | ||||||
Egypt | Widespread | Ibrahim et al., 1972; CABI/EPPO, 2002; Ibrahim and Handoo, 2016 | ||||||
Ethiopia | Present | Sharma and McDonald, 1990; CABI/EPPO, 2002 | ||||||
Gambia | Widespread | CABI/EPPO, 2002 | ||||||
Ghana | Widespread | CABI/EPPO, 2002 | ||||||
Guinea | Present | CABI/EPPO, 2002 | ||||||
Kenya | Present | Kanyagia, 1979; CABI/EPPO, 2002; Karuri et al., 2017 | ||||||
Liberia | Widespread | Lamberti et al., 1988; CABI/EPPO, 2002 | ||||||
Libya | Widespread | Khan and Dabaj, 1980; Dabaj and Jenser, 1987; CABI/EPPO, 2002 | ||||||
Madagascar | Widespread | Keetch and Buckley, 1984; CABI/EPPO, 2002 | ||||||
Malawi | Widespread | Keetch and Buckley, 1984; CABI/EPPO, 2002 | ||||||
Mauritania | Present | CABI/EPPO, 2002 | ||||||
Mauritius | Widespread | Lamberti et al., 1987; CABI/EPPO, 2002 | ||||||
Morocco | Widespread | CABI/EPPO, 2002 | ||||||
Mozambique | Present | Oever and Mangane, 1992; CABI/EPPO, 2002 | ||||||
Niger | Widespread | Sikora et al., 1988; CABI/EPPO, 2002 | ||||||
Nigeria | Widespread | Adesiyan and Odihirin, 1978; Babatola, 1980; CABI/EPPO, 2002 | ||||||
Réunion | Widespread | Keetch and Buckley, 1984; CABI/EPPO, 2002 | ||||||
Senegal | Widespread | Taylor, 1975; CABI/EPPO, 2002 | ||||||
Seychelles | Present | CABI/EPPO, 2002 | ||||||
Somalia | Restricted distribution | Karshe, 1993; CABI/EPPO, 2002 | ||||||
South Africa | Widespread | Van der Linde 1956; CABI/EPPO, 2002 | ||||||
Spain | ||||||||
-Canary Islands | Restricted distribution | CABI/EPPO, 2002 | ||||||
Sudan | Restricted distribution | CABI/EPPO, 2002 | ||||||
Tanzania | Widespread | Ahmed, 1975; Taylor et al., 1982; CABI/EPPO, 2002 | ||||||
Tunisia | Restricted distribution | Moens, 1985; CABI/EPPO, 2002 | ||||||
Uganda | Widespread | Bridge et al., 1991; CABI/EPPO, 2002 | ||||||
Zambia | Widespread | Keetch and Buckley, 1984; CABI/EPPO, 2002 | ||||||
Zimbabwe | Widespread | Martin and Armstrong, 1975; CABI/EPPO, 2002 | ||||||
North America | ||||||||
Bermuda | Widespread | Wang and Hughes, 1976; CABI/EPPO, 2002 | ||||||
Canada | Present | CABI/EPPO, 2002 | ||||||
-Ontario | Present | Johnson and Potter, 1980; CABI/EPPO, 2002 | ||||||
-Quebec | Absent, unreliable record | CABI/EPPO, 2002 | ||||||
Mexico | Widespread | Sosa, 1985; CABI/EPPO, 2002; Martínez et al., 2014 | ||||||
USA | Present | CABI/EPPO, 2002 | ||||||
-Alabama | Widespread | Walters and Barker, 1994; CABI/EPPO, 2002; Moye et al., 2018 | ||||||
-Arizona | Widespread | Walters and Barker, 1994; CABI/EPPO, 2002 | ||||||
-Arkansas | Widespread | Walters and Barker, 1994; CABI/EPPO, 2002 | ||||||
-California | Widespread | Taylor et al., 1982; Walters and Barker, 1994; CABI/EPPO, 2002 | ||||||
-Connecticut | Widespread | Walters and Barker, 1994; CABI/EPPO, 2002 | ||||||
-Florida | Widespread | Walters and Barker, 1994; CABI/EPPO, 2002 | ||||||
-Georgia | Widespread | Walters and Barker, 1994; CABI/EPPO, 2002 | ||||||
-Hawaii | Widespread | Walters and Barker, 1994; CABI/EPPO, 2002 | ||||||
-Illinois | Restricted distribution | Walters and Barker, 1994; CABI/EPPO, 2002 | ||||||
-Indiana | Restricted distribution | Walters and Barker, 1994; CABI/EPPO, 2002 | ||||||
-Kansas | Widespread | Walters and Barker, 1994; CABI/EPPO, 2002 | ||||||
-Kentucky | Widespread | Taylor et al., 1982; Walters and Barker, 1994; CABI/EPPO, 2002 | ||||||
-Louisiana | Widespread | Walters and Barker, 1994; CABI/EPPO, 2002 | ||||||
-Maryland | Widespread | Walters and Barker, 1994; CABI/EPPO, 2002 | ||||||
-Mississippi | Widespread | Walters and Barker, 1994; CABI/EPPO, 2002 | ||||||
-Missouri | Present | Walters and Barker, 1994; CABI/EPPO, 2002 | ||||||
-New Mexico | Widespread | Walters and Barker, 1994; CABI/EPPO, 2002 | ||||||
-New York | Widespread | Walters and Barker, 1994; CABI/EPPO, 2002 | ||||||
-North Carolina | Widespread | Taylor et al., 1982; Walters and Barker, 1994; CABI/EPPO, 2002 | ||||||
-Oklahoma | Widespread | Walters and Barker, 1994; CABI/EPPO, 2002 | ||||||
-Oregon | Widespread | Walters and Barker, 1994; CABI/EPPO, 2002 | ||||||
-Pennsylvania | Widespread | Walters and Barker, 1994; CABI/EPPO, 2002 | ||||||
-South Carolina | Widespread | Taylor et al., 1982; Walters and Barker, 1994; CABI/EPPO, 2002 | ||||||
-Tennessee | Widespread | Walters and Barker, 1994; CABI/EPPO, 2002 | ||||||
-Texas | Widespread | Taylor et al., 1982; Walters and Barker, 1994; CABI/EPPO, 2002 | ||||||
-Utah | Present | Campbell and Griffin, 1975; CABI/EPPO, 2002 | ||||||
-Virginia | Widespread | Walters and Barker, 1994; CABI/EPPO, 2002 | ||||||
-Washington | Widespread | Walters and Barker, 1994; CABI/EPPO, 2002 | ||||||
-West Virginia | Widespread | Walters and Barker, 1994; CABI/EPPO, 2002 | ||||||
Central America and Caribbean | ||||||||
Antigua and Barbuda | Present | Walker et al., 1974; CABI/EPPO, 2002 | ||||||
Barbados | Widespread | CABI/EPPO, 2002 | ||||||
Belize | Present | CABI/EPPO, 2002 | ||||||
Costa Rica | Widespread | Lopez, 1985; Sosa, 1985; CABI/EPPO, 2002 | ||||||
Cuba | Widespread | Cuadra et al., 1988; CABI/EPPO, 2002; Rivas and Gandarilla, 2012 | ||||||
Dominica | Present | Hunt, 1977; CABI/EPPO, 2002 | ||||||
Dominican Republic | Widespread | Roman and Grullon, 1975; CABI/EPPO, 2002 | ||||||
El Salvador | Widespread | Sosa, 1985; CABI/EPPO, 2002 | ||||||
Guadeloupe | Widespread | Kermarrec, 1974; CABI/EPPO, 2002 | ||||||
Guatemala | Widespread | CABI/EPPO, 2002 | ||||||
Haiti | Widespread | Crill et al., 1973; CABI/EPPO, 2002 | ||||||
Honduras | Widespread | Pinochet, 1977; CABI/EPPO, 2002 | ||||||
Jamaica | Widespread | Sosa, 1985; CABI/EPPO, 2002 | ||||||
Martinique | Present | Sosa, 1985; CABI/EPPO, 2002 | ||||||
Montserrat | Widespread | CABI/EPPO, 2002 | ||||||
Nicaragua | Widespread | Sosa, 1985; CABI/EPPO, 2002 | ||||||
Panama | Widespread | Sosa, 1985; CABI/EPPO, 2002 | ||||||
Puerto Rico | Widespread | Sosa, 1985; CABI/EPPO, 2002 | ||||||
Saint Lucia | Widespread | Introduced | Invasive | Hunt, 1977; CABI/EPPO, 2002 | ||||
Saint Vincent and the Grenadines | Widespread | Hunt, 1977; Sosa, 1985; CABI/EPPO, 2002 | ||||||
Trinidad and Tobago | Widespread | Bala, 1984; CABI/EPPO, 2002 | ||||||
South America | ||||||||
Argentina | Widespread | Doucet and Pinochet, 1992; CABI/EPPO, 2002 | ||||||
Bolivia | Widespread | CABI/EPPO, 2002 | ||||||
Brazil | Widespread | CABI/EPPO, 2002 | ||||||
-Bahia | Widespread | Freire and Ponte, 1976; CABI/EPPO, 2002 | ||||||
-Ceara | Widespread | Ponte, 1968; CABI/EPPO, 2002 | ||||||
-Espirito Santo | Widespread | CABI/EPPO, 2002 | ||||||
-Goias | Widespread | Lordello et al., 1986; CABI/EPPO, 2002 | ||||||
-Maranhao | Widespread | Silva, 1991; CABI/EPPO, 2002 | ||||||
-Mato Grosso do Sul | Widespread | Lordello and Marini, 1974; Tihohod and Ferraz, 1986; CABI/EPPO, 2002 | ||||||
-Minas Gerais | Widespread | Freire and Ferraz, 1977; CABI/EPPO, 2002 | ||||||
-Para | Widespread | Freire, 1976; CABI/EPPO, 2002 | ||||||
-Paraiba | Widespread | Lopes and Lordello, 1980; CABI/EPPO, 2002 | ||||||
-Parana | Widespread | Lordello and Lordello, 1972; Santos and Silva, 1984; CABI/EPPO, 2002 | ||||||
-Pernambuco | Widespread | CABI/EPPO, 2002 | ||||||
-Rio de Janeiro | Widespread | Goes et al., 1982; CABI/EPPO, 2002 | ||||||
-Rio Grande do Norte | Present | Ponte et al., 1977; CABI/EPPO, 2002 | ||||||
-Rio Grande do Sul | Widespread | Lordello and Marini, 1974; CABI/EPPO, 2002 | ||||||
-Santa Catarina | Widespread | Kalvelage and Brose, 1990; CABI/EPPO, 2002 | ||||||
-Sao Paulo | Widespread | Curi and Silveira, 1978; CABI/EPPO, 2002 | ||||||
Chile | Widespread | CABI/EPPO, 2002 | ||||||
Colombia | Present | CABI/EPPO, 2002 | ||||||
Ecuador | Widespread | Velastegui and Fiallos, 1987; CABI/EPPO, 2002 | ||||||
French Guiana | Present | CABI/EPPO, 2002 | ||||||
Guyana | Widespread | CABI/EPPO, 2002 | ||||||
Paraguay | Widespread | CABI/EPPO, 2002 | ||||||
Peru | Present | Vargas and Pajuelo, 1973; CABI/EPPO, 2002; Murga-Gutierrez et al., 2012 | ||||||
Suriname | Widespread | Sosa, 1985; CABI/EPPO, 2002 | ||||||
Uruguay | Present | Alvarez, 1970; CABI/EPPO, 2002 | ||||||
Venezuela | Widespread | CABI/EPPO, 2002 | ||||||
Europe | ||||||||
Albania | Restricted distribution | Shepherd and Barker, 1990 | ||||||
Belarus | Restricted distribution | CABI/EPPO, 2002 | ||||||
Belgium | Restricted distribution | Belgium Government ARC, 1974; CABI/EPPO, 2002 | ||||||
Bosnia-Hercegovina | Present | CABI/EPPO, 2002 | ||||||
Bulgaria | Restricted distribution | Stoyanov, 1980; Shepherd and Barker, 1990; CABI/EPPO, 2002 | ||||||
Cyprus | Restricted distribution | Philis, 1983; CABI/EPPO, 2002 | ||||||
Czech Republic | Present | Tesarová et al., 2003 | ||||||
Estonia | Present | CABI/EPPO, 2002 | ||||||
France | Widespread | Gautier, 1975; Shepherd and Barker, 1990; CABI/EPPO, 2002 | ||||||
Germany | Restricted distribution | Shepherd and Barker, 1990; CABI/EPPO, 2002 | ||||||
Greece | Restricted distribution | Kyrou, 1976; CABI/EPPO, 2002; Tzortzakakis et al., 2011 | ||||||
-Crete | Present | Tzortzakakis et al., 2016 | ||||||
Hungary | Restricted distribution | Shepherd and Barker, 1990; Amin and Budai, 1994; CABI/EPPO, 2002 | ||||||
Iceland | Present | CABI/EPPO, 2002 | ||||||
Italy | Present | CABI/EPPO, 2002; d'Errico et al., 2014 | ||||||
-Sicily | Present | Colombo et al., 2008 | ||||||
Latvia | Restricted distribution | CABI/EPPO, 2002 | ||||||
Lithuania | Restricted distribution | CABI/EPPO, 2002 | ||||||
Macedonia | Present | CABI/EPPO, 2002 | ||||||
Malta | Present | CABI/EPPO, 2002 | ||||||
Moldova | Present | CABI/EPPO, 2002 | ||||||
Montenegro | Present | Pajovic et al., 2007 | ||||||
Netherlands | Present | Netherlands Plantenziektenkundige Dienst, 1974; CABI/EPPO, 2002 | ||||||
Poland | Present | CABI/EPPO, 2002 | ||||||
Portugal | Widespread | CABI/EPPO, 2002 | ||||||
-Azores | Present | Vovlas et al., 2004 | ||||||
Romania | Present | CABI/EPPO, 2002 | ||||||
Russian Federation | Present | CABI/EPPO, 2002 | ||||||
-Central Russia | Present | CABI/EPPO, 2002 | ||||||
-Northern Russia | Present | CABI/EPPO, 2002 | ||||||
-Russian Far East | Present | CABI/EPPO, 2002 | ||||||
-Southern Russia | Present | CABI/EPPO, 2002 | ||||||
-Western Siberia | Present | CABI/EPPO, 2002 | ||||||
Serbia | Present | Bacic et al., 2016 | Bac?ki Vinogradi, Vojvodina Province | |||||
Slovakia | Present | Tesarová et al., 2003 | ||||||
Slovenia | Present | Sirca et al., 2003 | ||||||
Spain | Widespread | Tobar-Jiminez, 1984; Shepherd and Barker, 1990; CABI/EPPO, 2002; López-Robles et al., 2013 | ||||||
Switzerland | Present | CABI/EPPO, 2002 | ||||||
UK | Present | CABI/EPPO, 2002 | ||||||
-Scotland | Present | Tesarová et al., 2003 | ||||||
Ukraine | Present | CABI/EPPO, 2002 | ||||||
Yugoslavia (former) | Present | Grujicic, 1974 | ||||||
Yugoslavia (Serbia and Montenegro) | Present | CABI/EPPO, 2002 | ||||||
Oceania | ||||||||
American Samoa | Present | Brooks, 2002; CABI/EPPO, 2002 | ||||||
Australia | Widespread | Khair, 1986; CABI/EPPO, 2002 | ||||||
-Australian Northern Territory | Widespread | Khair, 1986; CABI/EPPO, 2002; Singh et al., 2012 | ||||||
-New South Wales | Widespread | Khair, 1986; CABI/EPPO, 2002 | ||||||
-Queensland | Widespread | Khair, 1986; CABI/EPPO, 2002 | ||||||
-South Australia | Widespread | Stirling, 1976; CABI/EPPO, 2002 | ||||||
-Tasmania | Widespread | Khair, 1986; CABI/EPPO, 2002 | ||||||
-Victoria | Widespread | Khair, 1986; CABI/EPPO, 2002 | ||||||
-Western Australia | Widespread | Khair, 1986; CABI/EPPO, 2002 | ||||||
Fiji | Widespread | Bridge, 1988; CABI/EPPO, 2002 | ||||||
Kiribati | Widespread | Bridge, 1988; CABI/EPPO, 2002 | ||||||
New Caledonia | Present | CABI/EPPO, 2002 | ||||||
New Zealand | Present | CABI/EPPO, 2002 | ||||||
Niue | Present | Bridge, 1988; CABI/EPPO, 2002 | ||||||
Norfolk Island | Present | Bridge, 1988; CABI/EPPO, 2002 | ||||||
Papua New Guinea | Widespread | Powell, 1974; Bridge, 1988; CABI/EPPO, 2002 | ||||||
Samoa | Widespread | Bridge, 1988; CABI/EPPO, 2002 | ||||||
Solomon Islands | Widespread | Bridge, 1988; CABI/EPPO, 2002 | ||||||
Tonga | Widespread | Bridge, 1988; CABI/EPPO, 2002 | ||||||
Tuvalu | Widespread | Bridge, 1988; CABI/EPPO, 2002 | ||||||
Vanuatu | Widespread | Bridge, 1988; CABI/EPPO, 2002 |
Risk of Introduction
Top of page M. incognita is widely endemic in subtropical and tropical regions, thus quarantine regulations would be superfluous and none are known to be in place.Habitat
Top of page M. incognita is found worldwide in tropical and subtropical regions, in particular in the warmer areas. For example, in California (USA), M. incognita is found more commonly in the hot valleys of the interior (Ferris and Van Gundy, 1979) and in East Africa it is restricted to altitudes below 2000 m above sea level (Whitehead, 1969). M. incognita is found on many soil types. Damage and yield losses caused are generally more severe on coarse-textured sandy soils (Van Gundy, 1985). Meloidogyne spp. are generally intolerant of flooded soil conditions.Hosts/Species Affected
Top of page M. incognita is probably the most widely distributed and economically important species of plant parasitic nematode in tropical and subtropical regions. Two-thirds of the root-knot nematode samples obtained from a number of tropical countries were of M. incognita (Sasser, 1979). In India alone, 232 plant genera have been reported as hosts to M. incognita (Krishnappa, 1985) and worldwide the species is a parasite of a wide range of crop plants.Host Plants and Other Plants Affected
Top of pageGrowth Stages
Top of page Flowering stage, Fruiting stage, Seedling stage, Vegetative growing stageSymptoms
Top of page Field symptoms are typically of stunted, poorly growing plants with yellowing leaves. Infected root systems show characteristic knots or galls, the severity of which varies with the degree of nematode infection and species and variety of plant parasitized (see Dropkin, 1989).List of Symptoms/Signs
Top of pageSign | Life Stages | Type |
---|---|---|
Leaves / abnormal colours | ||
Leaves / wilting | ||
Roots / galls along length | ||
Roots / reduced root system | ||
Roots / swollen roots | ||
Whole plant / dwarfing | ||
Whole plant / early senescence |
Biology and Ecology
Top of page The life cycles of Meloidogyne spp. are well studied and in their essentials differ little between the major species (De Guiran and Ritter, 1979). At 21°C M. incognita took 37 days to complete its life cycle on Antirrhinum majus, a similar time to that reported on soyabeans (temperatures not published) (Ibrahim and El-Saedy, 1987). Juveniles penetrate root tips, occasionally invading roots in the zone of root elongation. Invaded nematodes initiate the development of giant cells in the meristematic, cortical and xylem tissues of the root and galling of roots occurs. Third- and fourth-stage juveniles and young females occur after about 6-8 and 15 days, respectively. Adult females were observed after 20 days and egg laying commenced after 25 days (Ibrahim and El-Saedy, 1987).Natural enemies
Top of pageNotes on Natural Enemies
Top of page A considerable amount of work has been devoted to the biological control of root-knot nematodes in general and M. incognita in particular (Kerry, 1987). Most research has concentrated on the endoparasitic microorganism Pasteuria penetrans and the egg-parasitic fungus Paecilomyces lilanicus. Experimental work has been encouraging, for example P. penetrans in the control of M. incognita on tomatoes (Sayre, 1980) and P. lilanicus in the control of M. incognita on potatoes (Jatala, 1985). The development of P. lilanicus has reached the stage of multi-local field trials (Jatala, 1985). However, there are considerable problems in the preparation and incorporation of inocula of putative biocontrol agents and the practical application of such technology remains to be developed (Kerry, 1987).Pathway Vectors
Top of pageVector | Notes | Long Distance | Local | References |
---|---|---|---|---|
Clothing, footwear and possessions | Eggs and galls in soil. | Yes | ||
Containers and packaging - wood | Yes | |||
Land vehicles | Eggs and galls in soil. | Yes | ||
Eggs and galls in soil. | Yes | |||
Soil, sand and gravel | Eggs and galls in soil. | Yes |
Plant Trade
Top of pagePlant parts liable to carry the pest in trade/transport | Pest stages | Borne internally | Borne externally | Visibility of pest or symptoms |
---|---|---|---|---|
Bulbs/Tubers/Corms/Rhizomes | adults; eggs; juveniles | Yes | Yes | Pest or symptoms not visible to the naked eye but usually visible under light microscope |
Growing medium accompanying plants | adults; eggs; juveniles | Yes | Yes | Pest or symptoms not visible to the naked eye but usually visible under light microscope |
Roots | adults; eggs; juveniles | Yes | Yes | Pest or symptoms not visible to the naked eye but usually visible under light microscope |
Seedlings/Micropropagated plants | adults; eggs; juveniles | Yes | Yes | Pest or symptoms not visible to the naked eye but usually visible under light microscope |
Plant parts not known to carry the pest in trade/transport |
---|
Bark |
Flowers/Inflorescences/Cones/Calyx |
Fruits (inc. pods) |
Leaves |
Stems (above ground)/Shoots/Trunks/Branches |
True seeds (inc. grain) |
Wood |
Impact
Top of page IntroductionThe root knot nematode species, M. incognita, is the most widespread and probably the most serious plant parasitic nematode pest of tropical and subtropical regions throughout the world (Sasser, 1979). It occurs as a pest on a very wide range of crops. Most estimates of yield loss come from the use of nematicides and it should be noted that these can possibly cause other beneficial growth effects.
Cotton
The most accurate and detailed estimates of cotton yield losses due to nematodes have been undertaken in states of the USA where nematicides are regularly used. In Arkansas, where M. incognita is by far the most important nematode of cotton, yield losses after the application of nematicides are estimated at 1.5% annually; in South Carolina, M. incognita with other nematodes account for an estimated 5% loss annually (Kirkpatrick, 1988, 1989). In Texas over a 16-year period of field experiments, the average cotton yield increase was 26% when fields infested with M. incognita were fumigated with nematicides. In six Texan counties, where over 47% of field soils were infested with M. incognita, it was calculated that the total annual yield loss was 10.2% or 85,600 cotton bales (Orr and Robinson, 1984). Disease complexes involving M. incognita and vascular Fusarium wilt on cotton are well recognized. Where the two organisms occur together, increasing the nematode population has a greater effect on wilt incidence and cotton yield loss than an increase in the Fusarium population (Starr et al., 1989; Hillocks and Bridge, 1992; Hillocks, 1997).
Tobacco
Root knot nematodes, mainly M. incognita and M. javanica, are always pests of economic importance in tobacco culture, wherever the climate favours them (Barker et al., 1981; Shepherd and Barker, 1990). In North America, losses to tobacco from root knot nematodes, mainly M. incognita, have been estimated to range from 1% to 14% annually in areas where control measures are the norm (Shepherd and Barker, 1990). Root knot nematodes, probably M. incognita, have been estimated to cause 50 to 60% yield losses in parts of Turkey and losses of 25% from field infestation and 50% if the infestation started in the seedbed in India (Shepherd and Barker, 1990). The percentage loss in tobacco yield is estimated to be 8 to 9% for each ten-fold increase in the initial population of M. incognita (Barker et al., 1981). In Cuba, in the region where the highest quality tobacco for cigars is produced, the losses due to M. incognita are estimated at 27.5% of the crop potential of flue-cured tobacco (Garcia and Perez, 1987; Fernandez and Ortega, 1998).
Food Legumes
M. incognita is a major economic pest of food legumes in the tropics and subtropics (Sikora and Greco, 1990). Moderate soil populations of 1000 nematodes per plant in pathogenicity pot experiments can reduce pod yields of chickpea (Cicer arietinum) by 27% and very high soil populations of 10,000 per plant reduce pod yields by 87%. In M. incognita-infested field plots treated with nematicides, yield of chickpea can increase by 15 to 33% (Reddy, 1976). Common bean (Phaseolus vulgaris) is very badly damaged by Meloidogyne species in the tropics. Significant bean yield increases of 45 to 60% have been achieved in Kenya by reducing mixed soil populations of M. incognita and M. javanica with the application of nematicides (Ngundo and Taylor, 1974). Similarly in Peru and Colombia, in fields infested with mixed populations of Meloidogyne species, mainly M. incognita, common bean seed yield can be reduced by 26 to 63% depending on the bean cultivar grown and other factors (Mullin et al., 1991). M. incognita is a serious pest of Phaseolus vulgaris in the USA where there is a reduction of 66% in crop value in fields where the nematodes are not controlled. The reduced crop value is a result of a combination of reduced plant stands and a 27% lower average pod production by surviving plants (Smittle and Johnson, 1982). Cowpea (Vigna unguiculata) is another very susceptible host crop of M. incognita. In Nigerian soils where M. incognita is the predominant nematode parasite, application of nematicides can increase cowpea yields by 95 to 222% (Babatola and Omotade, 1991). Soyabean (Glycine max) is another legume severely damaged by root knot nematodes and in Brazil yield can be reduced by over 55% in the presence of M. incognita (Antonio, 1988). In India, nematicide application to farmers' fields infested with a mixture of M. incognita and Rotylenchulus reniformis increased yield of soyabean by 19% (Prasad, 1999).
Vegetables
M. incognita is a major pest of vegetables throughout the tropics and subtropics. Many crops grown as vegetables are susceptible to the nematode particularly tomato, aubergine, okra, cucumber, melon, carrot, gourds, lettuce and peppers. Estimates of vegetable crop losses due Meloidogyne species, mainly M. incognita and M. javanica, have ranged from 17 to 20% for aubergine (Solanum melongena), 18 to 33% for melon and 24 to 38% for tomato (Sasser, 1979). In India, yield losses of okra (Abelmoschus esculentus), tomato and aubergine field crops are estimated at 91%, 42 to 54% and 18%, respectively (Bhatti and Jain, 1977; Subramaniyan et al., 1990). Other trials in India using nematicides showed that in fields naturally infested with mixed populations of M. incognita and M. javanica the avoidable yield losses in peas, okra, tomato and bottle gourd (Lagenaria siceraria) crops is 46% to 56% (Sharma and Baheti, 1992).
Yams
The primary damage to yams (Dioscorea species) by M. incognita is in the reduction in quality and marketability of the tubers due to the extensive surface galling caused by the root knot nematodes (Jatala and Bridge, 1990). It is estimated that there is a reduction of 39 to 52% in the price of galled tubers compared with healthy ones (Nwauzor and Fawole, 1982). However, there are instances were the nematode is known to actually reduce yields, for example in Nigeria significant yield reduction can occur in D. alata due to M. incognita (Adesiyan and Odihirin, 1978). In Martinique, M. incognita is reported to have completely destroyed a crop of the yam D. trifida (Kermarrec, 1974). In India, pot experiments have demonstrated that even low nematode populations of 100 M. incognita juveniles per plant can cause a highly significant reduction in yam (D. rotundata) tuber weights of 27% and larger nematode populations over 55% yield loss (Mohandas and Ramakrishnan, 1997).
Potatoes
Losses of potatoes due to Meloidogyne species, mainly M. incognita, are estimated at 25% or more (Mai et al., 1981).
Spices
M. incognita is an important pest of black pepper (Piper nigrum) in many countries particularly in Brazil and India where infestation levels of over 90% have been reported (Koshy and Bridge, 1990). As few as 10 juveniles per plant can reduce black pepper growth by 16% under potted conditions (Koshy et al., 1979). Cardamom (Elettaria cardamomum) suffers yield losses of 32 to 47% in the presence of M. incognita in India (Ali, 1986). In Australia, M. incognita and M. javanica are pests of ginger and severe infestation of rhizomes can reduce yields by 57% (Pegg et al., 1974). In pot experiments, a reduction of 74% in ginger rhizome weight has been recorded with initial M. incognita soil populations of 10,000 nematodes (Sukumaran and Sundararaju, 1986).
Coffee
M. incognita is found in many coffee-growing areas in the world but it is in Brazil where its effects have been the most catastrophic. In Brazil, the nematode has caused the complete destruction of coffee plantations and resulted in major agricultural changes as farmers were forced to adopt alternative crops (Campos et al., 1990).
Diagnosis
Top of page General identification of root-knot nematode infestation can be conducted by competent nematologists with basic equipment. Identification of species within the genus Meloidogyne requires the services of specialized taxonomists. In addition to classical taxonomic techniques, biochemical methods are also being developed (Esbenshade and Triantaphyllou, 1985). The situation regarding M. incognita is complicated by the existence of morphologically indistinguishable races differentiated by their ability to reproduce on a range of test host plants (Hartman and Sasser, 1985).Detection and Inspection
Top of page Above-ground symptoms are non-specific (see Symptoms): examination of roots can reveal the presence of swollen roots and galls. Closer examination, for example with a hand lens, can show the presence of egg masses on the root surface.Similarities to Other Species/Conditions
Top of page Meloidogyne incognita is similar to other species of Meloidogyne. Confusion within this group is common as the characters used tend to be variable.Prevention and Control
Top of page Methods for the control of M. incognita vary with the production system used and the value of the crop. Chemical control may be used on high-value crops, and a wide range of chemicals are available (Johnson, 1985a; Hague and Gowen, 1987). Strategies of cultural control are less well developed and crop rotations are difficult to design because of the wide host range of M. incognita. Groundnuts or maize, which are both poor or non-hosts to M. incognita, have been evaluated for use in cropping systems designed to manage this nematode (Raymundo, 1985). Systems of integrating cropping sequences and chemical control have been evaluated in the USA (Johnson, 1985b). Resistance to M. incognita exists in a number of commercial crop varieties, principally vegetables (Lehman and Cochran, 1991). These have generally been developed in the USA, but have been evaluated in other parts of the world (for example, see Krishnappa, 1985).References
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Links to Websites
Top of pageWebsite | URL | Comment |
---|---|---|
Global register of Introduced and Invasive species (GRIIS) | http://griis.org/ | Data source for updated system data added to species habitat list. |
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