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.

Motabo

Terminated

Solanum lycopersicum L. · Tomato

INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR

2 records

Nemadex

Active

Vitis L. · Grapevine

INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR

1 record

Mongal

Withdrawn

Solanum lycopersicum L. · Tomato

INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR

1 record

Neon

Withdrawn

Sinapis alba L. · White mustard

VANDINTER RESEARCH B.V.

1 record

NEMAPEAR

Terminated

Solanum lycopersicum L. · Tomato

PETOSEED CO

1 record

Négresse

Active

Solanum tuberosum L. · Potato

INCONNU (FR)

1 record

Mytrydat F1

Active

Solanum lycopersicum L. · Tomato

Volok Ol`ha Anatoliivna, Amcheslavs`ka Olena Valentynivna, Moriev Viktor Vasyl`ovych, Havrysh Serhii Fedorovych,

2 records

MONO HY A I

Withdrawn

Beta vulgaris Sugar Beet Group · Sugar beet

G.WESTERN SUGAR

1 record

Milor

Terminated

Sinapis alba L. · White mustard

P.H. Petersen Saatzucht Lundsgaard GmbH Herrn Asmus Sören Petersen / Michaela Schlathölter

2 records

Milky

Active

Medicago sativa L. · Alfalfa

GIE GRASS (FR)

1 record

Misteriia

Active

Solanum tuberosum L. · Potato

Osypchuk, Alla Cherednichenko, Liubov Furdyha, Mykola Tomash, Anatolii Kupriianova, Tetiana Taktaiev, Borys Borzykh, Oleksandr Zakharchuk, Nataliia Bondarchuk, Anatolii

2 records

Micer

Active

Solanum lycopersicum L. · Tomato

Syngenta Crop Protection AG

2 records

N 00296

Active

Solanum lycopersicum L. · Tomato

Nunhems B.V.

2 records

Multa

Terminated

Solanum tuberosum L. · Potato

H. Mulder (NL)

2 records

Monty F1

Active

Solanum lycopersicum L. · Tomato

Teresa Beck Bunn

1 record

Mouna F1

Active

Solanum lycopersicum L. · Tomato

Mercier Jean-Claude

1 record

Meys F1

Active

Solanum lycopersicum L. · Tomato

Ali Yuksel

2 records

Melodie

Terminated

Raphanus sativus L. var. oleiformis Pers. · Oil radish

PETERSEN| Asmus Soeren Petersen in Fa. P.H. Petersen Saatzucht Lundsgaard GmbH & Co KG / BAECKER| Paul Baecker

1 record

Melodi

Active

Solanum tuberosum L. · Potato

J.P.Muijsers

1 record

MIRA

Terminated

Trifolium repens L. · White clover

FDB, ALBERTSLUND & DLF, ROSKILDE

1 record

MICHELE F1

Terminated

Solanum lycopersicum L. · Tomato

Paulo Koch

2 records

Maritta

Terminated

Solanum tuberosum L. · Potato

Franz Von Zwehl (DE)

2 records

MARA

Terminated

Solanum tuberosum L. · Potato

Kweekinstituut KARNA (NL)

1 record

MAESTRANZA

Application submitted

Capsicum annuum L. · Bell pepper

SEMILLAS FITO, S.A.

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.