Pests

Nematodes

Nematodes are microscopic roundworm endoparasites that feed on plant sap and cause significant yield losses. Varietal resistance is provided by genetic mechanisms that prevent pest reproduction and is assessed according to the International Seed Federation scale.

Mentioned in descriptions 13 637 varieties reference book.

Nematodes are microscopic roundworms ranging from 0.3 to 2 mm in size that act as obligate plant parasites. Most species penetrate root, stem, or bulb tissues, causing growth inhibition, wilting, and patchy crop development, with tissue damage often facilitating secondary infections.

Varietal resistance to nematodes is based on the plant's genetic apparatus, including specific R-genes that limit the feeding or reproduction of the pest. In some cases, protection is provided by a hypersensitive response, where local cell death occurs at the site of infection.

Protection efficacy is evaluated using International Seed Federation codes: HR denotes high resistance with limited parasite development under high inoculum pressure, while IR indicates intermediate resistance. The level of protection is race-specific and depends on the specific species and pathotype of the nematode.

Sources10

Breakdown by crop

Root-knot nematodes of tomato 1 711 Potato nematodes 1 231 Nematodes of sugar beet 287 Pepper Nematodes 154 Nematodes — Oilseed radish 143 Nematodes in white mustard 105 Nematodes — Tomato (Interspecific Hybrids) 79 Alfalfa nematodes 62 Barley nematodes 55 Root-knot nematodes of tomato 49 Soybean cyst nematode 35 Grapevine Nematodes 32 Plum nematodes 24 Peach nematodes 22 Rice nematodes 22 Nematodes in black oat 21 Nematodes of oats 20 Citrus Nematode 19 Nematodes — Prunus amygdalus x Prunus persica 16 Nematodes of White Clover 15 Nematodes in Prunus davidiana × Prunus persica hybrids 14 Nematodes — Solanum torvum Sw. 14 Nematodes — common wheat 14 Nematodes — hybrids between Citrus x aurantium L. x Citrus trifoliata L. 13

Found in these crops

Tomato 1 709 Potato 1 216 Sugar beet 288 Bell pepper 152 Oil radish 143 White mustard 105 hybrids between Solanum lycopersicum L. and S. habrochaites S. Knapp & D.M. Spooner 79 Alfalfa 62 Barley 53 Tomato 48 Soybean 33 Grapevine 32

Varieties that feature this in their description

Selection based on the description text, not official resistance ratings: such data is not available in registers. Mention indicates that the trait is discussed in the variety's sources; see the variety's profile for details on what is specifically stated.

LACARTA 657

Active

Solanum lycopersicum L. · Tomato

HAZERA SEEDS BV

1 record

Kiveli F1

Active

Solanum lycopersicum L. · Tomato

J. Hoogstarten

2 records

KWS C 909

Active

Solanum tuberosum L. · Potato

Stet Holland B.V.

1 record

KM22028

Active

Triticum aestivum L. · Bread wheat

KWS Momont Recherche Sarl

1 record

Krymsk 86

Active

Prunus L. · Plum

Information not available - Contact NL authorities

1 record

Kartier F1

Active

Solanum lycopersicum L. · Tomato

Mercier Jean-Claude

2 records

KEIRA

Withdrawn

Solanum lycopersicum L. · Tomato

HAZERA GENETICS

1 record

Kawemono desprez

Terminated

Beta vulgaris Sugar Beet Group · Sugar beet

KWS Kleinwanzlebener Saatzucht AG (DE)

1 record

Kniazha

Terminated

Solanum tuberosum L. · Potato

Dudar Ivan Frankovych, Lytvyn Ol`ha Fedorivna, Vlokh Volodymyr Hryhorovych,

2 records

Kapadokya

Application submitted

Solanum lycopersicum L. · Tomato

Manier Tohumculuk

1 record

Khortytsia

Active

Solanum tuberosum L. · Potato

Oliinyk Tetiana Mykolaivna, Zelia Heorhii Viorelovych, Roik Mykola Volodymyrovych, Rozhniatovskyi Andrii Olehovych, Podhaiets`kyi Anatolii Adamovych, Taktaiev Borys Anatoliiovych, Kupriianova Tetiana Mykolaivna, Zakharchuk Nataliia Anatoliivna, Furdyha My

2 records

Joasia

Withdrawn

Solanum tuberosum L. · Potato

Instytut Hodowli i Aklimatyzacji Roslin Panstwowy Instytut Badawczy

2 records

JOMAILA

Active

Solanum lycopersicum L. · Tomato

HAZERA SEEDS BV

1 record

Kawegigamono desprez

Terminated

Beta vulgaris Sugar Beet Group · Sugar beet

KWS Kleinwanzlebener Saatzucht AG (DE)/Florimond Desprez SA (FR)

1 record

Ishtara ISK

Withdrawn

Prunus domestica x (Prunus cerasifera x Prunus persica)

Instytut Sadownictwa i Kwiaciarstwa im. Szczepana Pieniążka

1 record

Julia

Withdrawn

Sinapis alba L. · White mustard

BREMER GERARD| Gerard H.M. Bremer

2 records

IRINOS

Application submitted

Solanum lycopersicum L. · Tomato

HAZERA SEEDS BV

1 record

Jolie

Active

Solanum lycopersicum L. · Tomato

HAZERA SEEDS BV

1 record

Jaguar F 1

Withdrawn

Solanum lycopersicum L. · Tomato

Seminis Vegetables (NL)

1 record

HIGAMA

Terminated

Prunus persica (L.) Batsch · Peach

INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR

1 record

HTT1750485

Active

Solanum lycopersicum L. · Tomato

Axia Vegetable Seeds B.V.

2 records

ISCI7

Withdrawn

Brassica carinata A. Braun · Ethiopian mustard

CREA- CENTRO DI RICERCA PER LE COLTURE INDUSTRIALI (CREA-CI-BO)

1 record

Heinz 3402 F1

Terminated

Solanum lycopersicum L. · Tomato

Dale M. Smith

2 records

HM 1091

Withdrawn

Beta vulgaris Sugar Beet Group · Sugar beet

Hilleshog AB (SE)

1 record

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Pests

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Text source

This summary is compiled from the publications listed in the sources and verified by an editor. It contains no legally significant information; it provides agronomic context for registry data rather than the registry data itself.