Datasheet
Meloidogyne hapla (root knot nematode)
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Pictures
Top of page| Picture | Title | Caption | Copyright |  | Title | Field symptoms |
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| Caption | Hot spot" in groundnut field infested with M. hapla. |
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| Copyright | ©R.A. Motsinger/Nemapix Vol. 1 |
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| Field symptoms | Hot spot" in groundnut field infested with M. hapla. | ©R.A. Motsinger/Nemapix Vol. 1 |
Identity
Top of pagePreferred Scientific Name
- Meloidogyne hapla Chitwood, 1949
Preferred Common Name
International Common Names
- English: Northern root knot nematode
- Spanish: nematodo norteno de quiste (Mexico)
- French: nodosité des racines
Local Common Names
- Germany: Älchen, Nördliches Wurzelgallen-
- Japan: kita-nekobu-sentyubyo
- Netherlands: wortelknobbelaaltje
- Turkey: kok ur nematodu
EPPO code
- MELGHA (Meloidogyne hapla)
Taxonomic Tree
Top of page
- Domain: Eukaryota
- Kingdom: Metazoa
- Phylum: Nematoda
- Family: Meloidogynidae
- Genus: Meloidogyne
- Species: Meloidogyne hapla
Notes on Taxonomy and Nomenclature
Top of pageMeloidogyne hapla was first described from the USA by Chitwood (1949). The type host was Solanum tuberosum and the type locality was Long Island, New York, USA. No synonyms are known, although some of the records attributed to this species refer to other species such as Meloidogyne chitwoodi.
Description
Top of pageMeasurements (after Whitehead, 1968).
Females (n=20): L = 419-845 (612) µm; width = 311-561 (430) µm; spear (9) = 10-13 (11) µm; width spear base (9) = 2-3 (2) µm; dorsal oesophageal gland orifice (8) = 4-6 (5) µm behind spear base; length median bulb (5) = 31-43 (36) µm; width median bulb (6) = 26-37 (31) µm; length median bulb valves (6) = 10-13 (12) µm; width median bulb valves (6) = 9-11 (10) µm.
Males (n=25): L = 791-1432 (1139) µm; a = 33.3-47.0 (41.7); length head (21) = 4.3-7.9 (5.6) µm; spear = 17.3-22.7 (20.0) µm; width spear base = 2.5-5.0 (3.5) µm; dorsal oesophageal gland orifice (8) = 2.5-3.2 (2.9) µm behind spear base; b' (total length divided by distance from anterior end to middle of median bulb) = 12.8-19.2 (15.5); c (24) = 73-283 (118); length median bulb (24) = 15.1-25.9 (19.2) µm; width median bulb (24) = 7.2-12.9 (9.3) µm; length median bulb valves (23) = 3.6-7.2 (5.9) µm; spicules (length of arc) (8) = 21.6-28.1 (25.7) µm; gubernaculum (5) = 7.2-9.4 (8.2) µm.
Infective juveniles (n=20) (J2): L = 312-355 (337) µm; a (18) = 20.1-26.6 (23.9); length tail (15) = 33-48 (43) µm; c (15) = 7.3-10.2 (7.9); c' (15) = 3.7-4.7 (4.4); length body to middle of genital primordium (13) = 177-214 (200) µm; spear (9) = 7.9-10.9 (9.7) µm.
Eggs (unembryonated) (n=20): 71-91 (78) µm 26-40 (31) µm.
Description (after Orton Williams, 1974)
Female: Body pyroid with short neck. Cuticle becoming thicker in posterior half of body, sometimes considerably. Head with two annules behind head-cap. Spear knobs rounded, inconspicuous. Excretory pore 14-20 annules behind head, hemizonid just posterior to pore. Posterior cuticular pattern roughly circular, composed of closely spaced smooth or slightly wavy striae. Dorsal arch low. Lateral fields may be unmarked, may be marked only by slight irregularities in the striae, or dorsal and ventral striae may meet at a slight angle along the fields. Some forking of striae at lateral fields may also occur. In some cases ventral striae may extend laterally on one or both sides to form 'wings' which the dorsal striae meet almost at right angles. Tail with few striae but distinct punctuations forming a stippled area between the anus and tail terminus. Sometimes the stippling may be more diffuse over the inner part of the pattern. Phasmids fairly widely spaced.
Male: Numerous in some populations, absent in others. Head not offset, a truncate cone to hemispherical in outline. Usually only one annule behind head-cap. Spear slender, spear knobs rounded and not offset. Anterior cephalid on second body annule, posterior cephalid just anterior to level of relaxed spear. Hemizonid 45-58 annules behind head, 0-4 annules anterior to excretory pore. Lateral field with four incisures. Tail terminus bluntly rounded; phasmids at about cloacal level. One or two testes. Spicules slightly curved, with small sharp processes projecting from the spicule wall at the junction of head and shaft into the spicule head. Gubernaculum crescentic, proximal end thicker than distal end.
Distribution
Top of pageM. hapla is extremely widely distributed, particularly in temperate regions and the cooler, higher altitude areas of the tropics. According to Whitehead (1969), M. hapla only flourishes at high altitudes above 6000 feet in East Africa (Kenya, Tanzania and Uganda), despite the abundance of host plants at lower altitudes. In Queensland, Australia, M. hapla was not found as far north as M. javanica (Colbran, 1958). Taylor and Buhrer (1958) reported that in the USA, M. hapla was the commonest root-knot nematode north of 39°N.
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.
| Country | Distribution | Last Reported | Origin | First Reported | Invasive | References | Notes | ASIA |
| Armenia | Present | | | | | CABI/EPPO, 2002 | |
| China | Present | | | | | Hu et al., 1997; CABI/EPPO, 2002 | |
| -Chongqing | Present | | | | | CABI/EPPO, 2002 | |
| -Fujian | Present | | | | | CABI/EPPO, 2002 | |
| -Hebei | Present | | | | | CABI/EPPO, 2002 | |
| -Henan | Present | | | | | CABI/EPPO, 2002 | |
| -Jiangsu | Present | | | | | CABI/EPPO, 2002 | |
| -Nei Menggu | Present | | | | | CABI/EPPO, 2002 | |
| -Shandong | Present | | | | | CABI/EPPO, 2002 | |
| -Shanxi | Present | | | | | CABI/EPPO, 2002 | |
| -Sichuan | Present | | | | | CABI/EPPO, 2002 | |
| -Yunnan | Present | | | | | CABI/EPPO, 2002; Dong et al., 2015 | |
| India | Present | | | | | Goyal et al., 1976; CABI/EPPO, 2002 | |
| -Himachal Pradesh | Present | | | | | CABI/EPPO, 2002 | |
| -Jammu and Kashmir | Present | | | | | CABI/EPPO, 2002 | |
| -Tamil Nadu | Present | | | | | CABI/EPPO, 2002 | |
| -Uttar Pradesh | Present | | | | | CABI/EPPO, 2002 | |
| -West Bengal | Present | | | | | CABI/EPPO, 2002 | |
| Indonesia | Present | | | | | CABI/EPPO, 2002 | |
| -Java | Present | | | | | CABI/EPPO, 2002 | |
| Iran | Present | | | | | Maafi & Mahdavian, 1997; CABI/EPPO, 2002; Gharabadiyan et al., 2012 | |
| Israel | Present | | | | | Minz, 1956; CABI/EPPO, 2002 | |
| Japan | Present | | | | | Mitsui et al., 1976; CABI/EPPO, 2002 | |
| -Hokkaido | Present | | | | | CABI/EPPO, 2002 | |
| -Honshu | Present | | | | | CABI/EPPO, 2002 | |
| -Kyushu | Present | | | | | CABI/EPPO, 2002 | |
| -Ryukyu Archipelago | Present | | | | | CABI/EPPO, 2002 | |
| -Shikoku | Present | | | | | CABI/EPPO, 2002 | |
| Kazakhstan | Present | | | | | CABI/EPPO, 2002 | |
| Korea, Republic of | Present | | | | | Choi, 1981; CABI/EPPO, 2002 | |
| Kyrgyzstan | Present | | | | | CABI/EPPO, 2002 | |
| Malaysia | Present | | | | | Muhammad, 1992; CABI/EPPO, 2002 | |
| Mongolia | Present | | | | | CABI/EPPO, 2002 | |
| Pakistan | Present | | | | | Gul & Saeed, 1990; CABI/EPPO, 2002 | |
| Philippines | Present | | | | | CABI/EPPO, 2002 | |
| Sri Lanka | Present | | | | | CABI/EPPO, 2002 | |
| Taiwan | Present | | | | | Ruelo, 1981; CABI/EPPO, 2002 | |
| Tajikistan | Present | | | | | CABI/EPPO, 2002 | |
| Thailand | Present | | | | | Ratanaprapa & Chunram, 1988; CABI/EPPO, 2002 | |
| Turkey | Present | | | | | CABI/EPPO, 2002 | |
| Turkmenistan | Present | | | | | Arutyunov, 1992; CABI/EPPO, 2002 | |
| Uzbekistan | Present | | | | | Narbaev, 1976; CABI/EPPO, 2002 | |
AFRICA |
| Algeria | Present, few occurrences | | | | | CABI/EPPO, 2002 | |
| Côte d'Ivoire | Present | | | | | Kouame et al., 1997; CABI/EPPO, 2002 | |
| Egypt | Present | | | | | CABI/EPPO, 2002 | |
| Ethiopia | Present | | | | | Meressa et al., 2014 | |
| Kenya | Present | | | | | Parlevliet, 1971; Whitehead, 1969; CABI/EPPO, 2002; Karuri et al., 2017 | |
| Libya | Present | | | | | Dabaj & Jenser, 1987; CABI/EPPO, 2002 | |
| Malawi | Present | | | | | Saka, 1990; CABI/EPPO, 2002 | |
| Morocco | Present | | | | | CABI/EPPO, 2002 | |
| Nigeria | Present | | | | | CABI/EPPO, 2002 | |
| South Africa | Present | | | | | Van, 1956; Kleynhans, 1991; CABI/EPPO, 2002 | |
| Tanzania | Present | | | | | Swai et al., 1996; Whitehead, 1969; CABI/EPPO, 2002 | |
| Uganda | Present | | | | | Whitehead, 1969; CABI/EPPO, 2002 | |
| Zimbabwe | Restricted distribution | | | | | Martin, 1961; Shepherd & Coombs, 1981; CABI/EPPO, 2002 | |
NORTH AMERICA |
| Canada | Widespread | | | | | Potter et al., 1972; CABI/EPPO, 2002 | |
| -New Brunswick | Restricted distribution | | | | | CABI/EPPO, 2002 | |
| -Ontario | Present | | | | | CABI/EPPO, 2002 | |
| -Prince Edward Island | Present | | | | | CABI/EPPO, 2002 | |
| -Quebec | Present | | | | | CABI/EPPO, 2002 | |
| Mexico | Present | | | | | CABI/EPPO, 2002 | |
| USA | Widespread | | | | | Chitwood, 1949; CABI/EPPO, 2002 | |
| -California | Present | | | | | CABI/EPPO, 2002 | |
| -Connecticut | Present | | | | | LaMondia, 2002 | |
| -Florida | Present | | | | | CABI/EPPO, 2002 | |
| -Hawaii | Present | | | | | Handoo et al., 2005 | |
| -Idaho | Present | | | | | CABI/EPPO, 2002 | |
| -Maine | Present | | | | | CABI/EPPO, 2002 | |
| -Michigan | Present | | | | | CABI/EPPO, 2002 | |
| -Minnesota | Present | | | | | CABI/EPPO, 2002 | |
| -Nevada | Present | | | | | CABI/EPPO, 2002 | |
| -New Jersey | Present | | | | | CABI/EPPO, 2002 | |
| -New York | Present | | | | | CABI/EPPO, 2002 | |
| -North Carolina | Present | | | | | CABI/EPPO, 2002 | |
| -North Dakota | Present | | | | | CABI/EPPO, 2002 | |
| -Ohio | Present | | | | | CABI/EPPO, 2002 | |
| -Oklahoma | Present | | | | | CABI/EPPO, 2002 | |
| -Oregon | Present | | | | | CABI/EPPO, 2002 | |
| -Pennsylvania | Present | | | | | CABI/EPPO, 2002 | |
| -Rhode Island | Present | | | | | Mennan et al., 2006 | |
| -Tennessee | Present | | | | | CABI/EPPO, 2002 | |
| -Texas | Present | | | | | Wheeler et al., 2000 | |
| -Utah | Present | | | | | CABI/EPPO, 2002 | |
| -Virginia | Present | | | | | CABI/EPPO, 2002 | |
| -Washington | Present | | | | | CABI/EPPO, 2002 | |
| -Wisconsin | Present | | | | | Mennan et al., 2006 | |
| -Wyoming | Present | | | | | CABI/EPPO, 2002 | |
CENTRAL AMERICA AND CARIBBEAN |
| Costa Rica | Present | | | | | Lopez, 1991; CABI/EPPO, 2002 | |
| Guatemala | Present | | | | | Hernandez et al., 2004 | |
| Panama | Present | | | | | CABI/EPPO, 2002 | |
SOUTH AMERICA |
| Argentina | Present | | | | | Chaves & Torres, 1993; CABI/EPPO, 2002 | |
| Brazil | Present | | | | | Lordello & Monteiro, 1974; CABI/EPPO, 2002 | |
| -Bahia | Present | | | | | CABI/EPPO, 2002 | |
| -Ceara | Present | | | | | CABI/EPPO, 2002 | |
| -Goias | Restricted distribution | | | | | CABI/EPPO, 2002 | |
| -Minas Gerais | Present | | | | | CABI/EPPO, 2002 | |
| -Para | Present | | | | | CABI/EPPO, 2002 | |
| -Parana | Present | | | | | CABI/EPPO, 2002 | |
| -Pernambuco | Present | | | | | CABI/EPPO, 2002 | |
| -Rio Grande do Norte | Present | | | | | CABI/EPPO, 2002 | |
| -Rio Grande do Sul | Present | | | | | CABI/EPPO, 2002 | |
| -Santa Catarina | Restricted distribution | | | | | CABI/EPPO, 2002 | |
| -Sao Paulo | Restricted distribution | | | | | CABI/EPPO, 2002 | |
| Chile | Present | | | | | Philippi et al., 1996; CABI/EPPO, 2002 | |
| Colombia | Present | | | | | CABI/EPPO, 2002 | |
| Ecuador | Widespread | | | | | CABI/EPPO, 2002 | |
| Paraguay | Present | | | | | CABI/EPPO, 2002 | |
| Peru | Present | | | | | Vargas & Pajuelo, 1973; CABI/EPPO, 2002 | |
| Uruguay | Present | | | | | Robertson et al., 2006 | |
| Venezuela | Present | | | | | CABI/EPPO, 2002 | |
EUROPE |
| Belarus | Present | | | | | Gladkaya, 1983; CABI/EPPO, 2002 | |
| Belgium | Present | | | | | Coolen & Hendrickx, 1972; CABI/EPPO, 2002 | |
| Bulgaria | Present | | | | | Stoyanov, 1980; CABI/EPPO, 2002 | |
| Czech Republic | Present | | | | | Zouhar et al., 2003 | |
| Estonia | Present | | | | | Krall, 1970; CABI/EPPO, 2002 | |
| Europe | Present | | | | | | |
| Finland | Present | | | | | Tiilikkala, 1991; CABI/EPPO, 2002 | |
| Former USSR | Present | | | | | | |
| France | Present | | | | | Berge et al., 1972; CABI/EPPO, 2002 | |
| Germany | Present | | | | | Sturhan, 1976; CABI/EPPO, 2002 | |
| Greece | Present | | | | | Pyrowolakis, 1975; CABI/EPPO, 2002 | |
| Hungary | Present | | | | | Budai, 1979; CABI/EPPO, 2002 | |
| Italy | Present | | | | | Ambrogioni, 1969; CABI/EPPO, 2002 | |
| Latvia | Present | | | | | Erenfelde, 1984; CABI/EPPO, 2002 | |
| Lithuania | Present | | | | | Efremenko & Klimakova, 1972; CABI/EPPO, 2002 | |
| Macedonia | Present | | | | | CABI/EPPO, 2002 | |
| Moldova | Present | | | | | CABI/EPPO, 2002 | |
| Netherlands | Present | | | | | Brinkman, 1975; CABI/EPPO, 2002 | |
| Norway | Present | | | | | Stoeen, 1974; CABI/EPPO, 2002 | |
| Poland | Present | | | | | Berbec, 1972; CABI/EPPO, 2002 | |
| Portugal | Present | | | | | Santos et al., 1987; CABI/EPPO, 2002 | |
| Romania | Present | | | | | Romascu et al., 1974; CABI/EPPO, 2002 | |
| Russian Federation | Widespread | | | | | Pokharel & Kruchina, 1991; CABI/EPPO, 2002 | |
| -Central Russia | Present | | | | | CABI/EPPO, 2002 | |
| -Southern Russia | Present | | | | | CABI/EPPO, 2002 | |
| -Western Siberia | Present | | | | | CABI/EPPO, 2002 | |
| Slovakia | Present | | | | | CABI/EPPO, 2002 | |
| Slovenia | Present | | | | | ?irca & Urek, 2005 | |
| Spain | Present | | | | | Pinochet et al., 1989; CABI/EPPO, 2002 | |
| Switzerland | Present | | | | | Vallotton, 1981; CABI/EPPO, 2002 | |
| UK | Present | | | | | Southey, 1974; CABI/EPPO, 2002 | |
| Ukraine | Present | | | | | CABI/EPPO, 2002; Zinovev & Volodchenko, 1984 | |
| Yugoslavia (former) | Present | | | | | Grujicic & Paunovic, 1971 | |
| Yugoslavia (Serbia and Montenegro) | Present | | | | | CABI/EPPO, 2002 | |
OCEANIA |
| Australia | Widespread | | | | | Colbran, 1958; CABI/EPPO, 2002 | |
| -New South Wales | Present | | | | | CABI/EPPO, 2002 | |
| -Queensland | Present | | | | | CABI/EPPO, 2002 | |
| -South Australia | Present | | | | | CABI/EPPO, 2002 | |
| -Tasmania | Present | | | | | Pethybridge et al., 2008 | |
| New Zealand | Present | | | | | Dale, 1973; CABI/EPPO, 2002 | |
| Norfolk Island | Present | | | | | Bridge, 1988; CABI/EPPO, 2002 | |
| Papua New Guinea | Widespread | | | | | Bridge, 1988; CABI/EPPO, 2002 | |
Risk of Introduction
Top of pageM. hapla represents a severe risk to agricultural areas where it is not currently found, but as the species is virtually cosmopolitan the actual phytosanitary risk is probably low.
Habitat
Top of pageThe infective second stage juveniles are found in the soil where they hatch from the eggs. The second stage penetrates a suitable root and all subsequent stages are located within the root tissue of the host where they remain as sedentary endoparasites with the exception of the adult vermiform male which may escape from the root into the soil.
Hosts/Species Affected
Top of pageM. hapla is extremely polyphagous, attacking a wide variety of crops and weeds. Goodey et al. (1965) listed over 550 hosts and many more have been added since then. The species has recorded hosts in most of the higher plant families and attacks both herbaceous and woody plants. However, many grasses and cereals appear to be non-hosts. Carter (1985) provided a review of the recorded hosts.
Growth Stages
Top of pageSeedling stage, Vegetative growing stage
Symptoms
Top of pageTypical symptoms of attack include a galling of the root system, the galls being relatively small and subspherical, often with a marked proliferation of small roots at the site of the gall (this is in contrast to the symptoms caused by other common species of Meloidogyne). In potato tubers, brown spots appearing in the tubers after the females commence egg production may identify infection sites. Severe attack by M. hapla results in impaired root function and concomitant stunting of the above ground parts leading to a reduction in yield.
Symptoms List
Top of page| Sign | Life Stages | Type | Leaves |
| abnormal colours | | |
Roots |
| galls along length | | |
| reduced root system | | |
Whole plant |
| dwarfing | | |
| early senescence | | |
Biology and Ecology
Top of pageM. hapla is an obligate sedentary endoparasite of plant roots and tubers. The second stage infective juvenile penetrates the root and settles down within the cortex. As with all root-knot nematodes, a giant cell system of trophic cells is formed by the plant in response to secretions from the nematode. With each moult the nematode becomes more obese, although males become vermiform at the last moult and then emerge into the soil. The obese female swells enormously and produces numerous eggs (typically about 500) in a protective gelatinous matrix.
Unlike many root knot nematodes, M. hapla can withstand cold, eggs and juveniles surviving field temperatures below 0°C. However, it seems to be less tolerant of high temperatures than Meloidogyne incognita, for example. The optimum temperature for invasion and growth of M. hapla is in the range 20-25°C, a mean temperature of 27°C being inimical to development.
The nematode may be associated with other pathogens, including bacteria (such as Pseudomonas caryophylli) and fungi (such as Fusarium oxysporum, Rhizoctonia solani and Verticillium dahliae).
For further information see Orton Williams (1974).
Notes on Natural Enemies
Top of pagePasteuria penetrans is known to parasitize root knot nematodes. The soil-dwelling second stage juveniles may be infected during the soil phase (Den Belder and Jansen, 1994). Arthrobotrys is also known to entrap the juveniles (Oostendorp et al., 1990; Watson et al., 1990).
Seedborne Aspects
Top of pageM. hapla is not seedborne in the usual interpretation of the term, although it may be transmitted by infected planting material such as seed potatoes.
Plant Trade
Top of page| Plant 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 | No | 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 pageM. hapla attacks nearly all temperate vegetables of economic importance and is well known as being capable of causing considerable reductions in yield, even to the point of total crop loss. In the field, crops including lucerne, groundnut, potato, carrot, sugarbeet, strawberry, pyrethrum and onion may be severely affected. For further quantitative information, see Luc et al. (1990) and Evans et al. (1993).
Detection and Inspection
Top of pageM. hapla may be detected within the galled roots and tubers of the host by careful dissection and examination under the stereomicroscope. The infective juveniles may be recovered from soil using standard extraction methodologies as may the adult vermiform males when these occur.
Similarities to Other Species/Conditions
Top of pageM. hapla is broadly similar to other members of the genus and normally requires the service of an experienced nematologist to identify to species level with any certainty. A suite of morphological characters, including the form of the perineal pattern of the mature female and the length and form of the second stage juvenile tail facilitate identification. Confusion with Meloidogyne chitwoodi is possible and PCR assays have been developed to assist in the rapid differentiation of the species. The galls formed by this species are usually rather atypical of root-knot nematodes in general in that they are often rather discrete and globular and arranged along the root. This symptom may be confused with galling by Nacobbus aberrans, the false root-knot nematode, and care should be taken to examine the nematodes inside the gall to confirm their identity.
Prevention and Control
Top of page
Various methods have been used to cleanse planting material, including hot water treatment (McDonald and Misari, 1976; Zunke, 1981) and a range of nematicidal drenches. Treatment in the field also relies upon the application of nematicides although frequent rotation with cereals or other graminaceous non-host crops may also be efficacious. Glasshouse soils may be fumigated to eradicate the pest. Many crops have potential for development of resistant or tolerant varieties.
For general information on the use of nematicides see Luc et al. (1990) and Evans et al. (1993). Both granular and liquid formulations have been used to control this nematode. More recent papers on this subject include LaMondia (1994), Johnston et al. (1995, 1996), Phipps et al. (1995) and Phipps and Eisenback (1996).
References
Top of page?irca S, Urek G, 2005. Root-knot nematodes Meloidogyne spp. in Slovenia. (Ogorcice koreninskih ?i?k Meloidogyne spp. v Sloveniji.) In: Lectures and papers presented at the 7th Slovenian Conference on Plant Protection, Zrece, Slovenia, 8-10 March 2005. Ljubljana, Slovenia: Dru?tvo za varstvo rastlin Slovenije, 353-355.
Ambrogioni L, 1969. Two cases of mixed infections by nematodes of the genera Heterodera and Meloidogyne. Redia, 51:159-168
Arutyunov AV, 1992. The northern gall nematode Meloidogyne hapla Chitwood, 1949 - parasite of wild medicinal plants of Turkmenistan. Izvestiya Akademii Nauk Turkmenskoi SSR. Seriya Biologicheskikh Nauk, No. 2:24-29; 15 ref.
Belder E den, Jansen E, 1994. The influence of temperature, nutrition, light and the growth time of the mycelium on capture and infection of Meloidogyne hapla and Arthrobotrys oligospora. Fundamental and Applied Nematology, 17(1):57-66
Berbec E, 1972. Badania nad wystepowaniem i szkodliwoscia matwika polnocnego (Meloidogyne hapla Chitwood) na marchwi. Prace Wydzialu Nauk Przyrodniczych Bydgoskiego Towarzystwa Naukowego Ser. B, 15:3-32.
Berge JB, Dalmasso A, Ritter M, 1972. Studies on Meloidogyne hapla found in France. International Symposium of Nematology (11th), European Society of Nematologists, Reading, UK, 3-8 September, 1972. 2-3.
Bridge J, 1988. Plant-parasitic nematode problems in the Pacific Islands. Journal of Nematology, 20(2):173-183.
Brinkman H, 1975. Nematological observations in 1973 and 1974. Gewasbescherming, 6(4):57-64
Budai C, 1979. Spread of, and damage caused by the root knot nematode, Meloidogyne hapla Chitwood in the red pepper growing area of Szeged. Acta Phytopathologica Academiae Scientiarum Hungaricp, 14(3/4):543-548
CABI/EPPO, 2002. Meloidogyne hapla. Distribution Maps of Plant Diseases, No. 853. Wallingford, UK: CAB International.
Carter CC, 1985. Literature search: Host range of Meloidogyne hapla. International Nematology Network Newsletter, 2:16-24.
Chaves E, Torres M, 1993. Parasitic nematodes of potatoes in the south east of Buenos Aires. Boletin Tecnico, Estacion Experimental Agropecuaria, Balcarce, 115.
Chitwood BG, 1949. 'Root-knot nematodes'. Part 1. A revision of the genus Meloidogyne Goeldi, 1887. Proceedings of the Helminthological Society of Washington, 16:90-114.
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Distribution Maps
Top of page
- = Present, no further details
- = Evidence of pathogen
- = Widespread
- = Last reported
- = Localised
- = Presence unconfirmed
- = Confined and subject to quarantine
- = See regional map for distribution within the country
- = Occasional or few reports