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.

HM 0371

Application submitted

Solanum lycopersicum L. · Tomato

HM Clause Inc (US)

1 record

HM4885

Application submitted

Solanum lycopersicum L. · Tomato

Jeffrey Skoneczka

1 record

Heinz 2206 F1

Terminated

Solanum lycopersicum L. · Tomato

Dale M. Smith

2 records

Heinz 1015 F1

Terminated

Solanum lycopersicum L. · Tomato

Dale M. Smith

2 records

Hector F1

Terminated

Solanum lycopersicum L. · Tomato

Jean Clause Mercier

2 records

Hawaii

Terminated

Tagetes erecta L. · African marigold

PLANTICO HODOWLA I NASIENNICTWO OGRODNICZE ZIELONKI SP. Z O.O.

1 record

Hybriforce 3400

Application submitted

Medicago sativa L. subsp. sativa · Alfalfa

PANAM FRANCE SARL

1 record

HYBRID 9889

Terminated

Solanum lycopersicum L. · Tomato

PETOSEED CO

1 record

Grimpola

Application submitted

Capsicum annuum L. · Bell pepper

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

2 records

Honcharivs`ka

Terminated

Solanum tuberosum L. · Potato

Mel`nyk Pavlo Oleksiiovych, Sihar`ova Dina Dmytrivna, Dihtiar`ov Viktor Mykolaiovych, Sumets` IUrii Ivanovych, Sakhoshko Mykola Mykolaiovych, Kozhushko Neli Semenivna,

2 records

HM 5900

Active

Solanum lycopersicum L. · Tomato

Jeffrey Skoneczka

1 record

Gravesac

Active

Vitis vinifera L. · Common grape vine

DOAZAN JEAN PIERRE

1 record

Honcharivska (Sumchanka-2)

Withdrawn

Solanum tuberosum L. · Potato

SIHAROVA DINA, SUMETS IURII, SAKHOSHKO MYKOLA, DIHTIAROV VIKTOR, MELNYK PAVLO, KOZHUSHKO NELI

2 records

Heinz 8504 F1

Terminated

Solanum lycopersicum L. · Tomato

Dale M. Smith

2 records

Gravitet F1

Active

Solanum lycopersicum L. · Tomato

Jozsef Mozsar

1 record

HEIDRUN

Terminated

Solanum tuberosum L. · Potato

WOLF LANGE

2 records

Halileia F1

Active

Solanum lycopersicum L. · Tomato

Moshe Zalsman

2 records

GUARANÍ

Application submitted

Solanum lycopersicum L. · Tomato

MERIDIEM SEEDS S.L.

1 record

GF 677

Protection expired

Prunus persica (L.) Batsch · Peach

INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR

1 record

GF 557

Terminated

Prunus persica (L.) Batsch · Peach

INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR

1 record

H 9280

Terminated

Solanum lycopersicum L. · Tomato

Heinz North America Seed Department

1 record

GLENROE

Terminated

Solanum tuberosum L. · Potato

001. Teagasc, IE

1 record

GITTE

Withdrawn

Hordeum vulgare L. · Barley

PAJBJERG A/S

2 records

GATOR BELLE

Withdrawn

Capsicum annuum L. · Bell pepper

PETOSEED CO

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.