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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.

Mesias

Active

Solanum lycopersicum L. · Tomato

Scott Williams

FR
5 records

Meireska

Active

Solanum tuberosum L. · Potato

Niederösterreichische Saatbaugenossenschaft reg.Gen.m.b.H.

AT
4 records

Montenegro

Active

Solanum lycopersicum L. · Tomato

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

NL
5 records

Monegro

Active

Prunus amygdalus x Prunus persica

Joaquín Gómez Aparisi^^^Antonio J. Felipe Mansergas^^^Rafael Socias i Company

ES
5 records

Monarch

Active

Pisum sativum L. · Pea

ProGene Plant Research LLC

NL
3 records

Modykano

Active

Solanum lycopersicum L. · Tomato

Syngenta Seeds B.V.

NL
6 records

Mayan Twilight

Active

Solanum tuberosum L. · Potato

SCOTTISH CROP RESEARCH INSTITUTE

IE
5 records

Mirante

Active

Solanum lycopersicum L. · Tomato

RIJK ZWAAN ZAADTEELT EN ZAADHANDEL B.V.

NL
5 records

Maya

Active

Solanum tuberosum L. · Potato

Danespo A/S

DK
5 records

Meera

Active

Solanum tuberosum L. · Potato

PLANTERA SEED BV

NL
6 records

McNair 220

Active

Gossypium hirsutum L. · Upland cotton

STONEVILLE PEDIGREED SEED COMPANY

ES
3 records

Megusta

Active

Solanum tuberosum L. · Potato

Bavaria Saat GbR

DE
4 records

Miko

Active

Solanum lycopersicum L. · Tomato

Sakata Vegenetics (Pty) Ltd (ZA)/Sakata Seed Sudamerica Ltd (BR)

FR
3 records

Maryna

Active

Sinapis alba L. · White mustard

Firma Nasienna GRANUM - Z. Manias - S. Menc - J. Szymański Spółka Jawna

PL
4 records

Maracana

Active

Solanum lycopersicum L. · Tomato

Yuksel Tohumculuk Tarim San. ve Tic. Ltd. Sti.

PL
3 records

Maverick

Active

Solanum tuberosum L. · Potato

Station de Recherche du Comité Nord G.I.E.

FR
5 records

Marizza

Active

Solanum tuberosum L. · Potato

Niederösterreichische Saatbaugenossenschaft reg.Gen.m.b.H.

AT
5 records

Marmara

Active

Solanum lycopersicum L. · Tomato

Yuksel Tohumculuk LTD

NL
3 records

Marlie

Active

Solanum tuberosum L. · Potato

Europlant Pflanzenzucht GmbH

DE
6 records

Magnum 7

Active

Medicago sativa L. · Alfalfa

Velde Mike John

UA
4 records

Manyla

Active

Solanum lycopersicum L. · Tomato

SEMILLAS FITO, S.A.

ES
3 records

Mayan Rose

Active

Solanum tuberosum L. · Potato

JAMES HUTTON LTD

IE
5 records

Mega

Active

Sinapis alba L. · White mustard

FREIHERR VON MOREAU SAATZUCHT

IT
3 records

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