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.

BTS 4200 N

Active

Beta vulgaris Sugar Beet Group · Sugar beet

Betaseed GmbH (DE)

BE DE FR NL

5 records

BTS 2510 N

Terminated

Beta vulgaris Sugar Beet Group · Sugar beet

Betaseed Inc. (US)

BE DE FR NL

5 records

Artana

Protection expired

Solanum tuberosum L. · Potato

KUPER| G.J. Kuper

DE DK FR NL

6 records

Baronika KWS

Active

Beta vulgaris Sugar Beet Group · Sugar beet

KWS SAAT SE&CO.KGaA, DE

DE DK FR SE

6 records

BTS 7945 N

Active

Beta vulgaris Sugar Beet Group · Sugar beet

Betaseed

CZ IT PL UA

5 records

Agora

Active

Solanum lycopersicum L. · Tomato

VILMORIN, S.A.

BG ES FR HR

6 records

Ackersegen

Active

Solanum tuberosum L. · Potato

Kartoffelzucht Böhm Ing. Gebrüder Böhm K.G.

AT DE FR SK

5 records

Eldorado

Active

Solanum tuberosum L. · Potato

Van Rijn France

FR HR NL

8 records

BTS 6975 N

Active

Beta vulgaris Sugar Beet Group · Sugar beet

Betaseed Inc. (US)

DE ES FR

5 records

Nike

Active

Avena sativa L. · Oat

Lantmannen ek for, SE 268-81 Svalov

EE SE

7 records

Trick

Active

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

Semundo Saatzuht GmbH Teendorf (DE)

DE HR NL

7 records

Wotan

Active

Solanum tuberosum L. · Potato

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

AT DK FR

7 records

Stine 07P32

Active

Glycine max (L.) Merr. · Soybean

STINE SEED CO.

PL RO UA

6 records

Vindika

Active

Solanum tuberosum L. · Potato

VERENIGDE KWEEKBEDRIJVEN (NL)

DE FR IE

10 records

Sirola

Terminated

Sinapis alba L. · White mustard

KWS SAAT SE & CO.KGAA

DE NL PL

7 records

Serval

Active

Sinapis alba L. · White mustard

SESVANDERHAVE N.V./S.A. (BE)

DE HR SI

7 records

Saphir

Active

Trifolium pratense L. · Red clover

Norddeutsche Pflanzenzucht Hans-Georg Lembke KG. Herrn Dr. Martin Frauen / Wilbert Luesink

DE FR NL

7 records

Rubis

Active

Solanum tuberosum L. · Potato

Federation des Syndicats Bretons (FR)

ES FR PT

7 records

Rosamunda

Active

Solanum tuberosum L. · Potato

Svalof Weibull AB

FI IE SE

6 records

Smart Nelda KWS

Active

Beta vulgaris Sugar Beet Group · Sugar beet

KWS SAAT SE and CO KGAA

DE DK SE

5 records

Seresta

Active

Solanum tuberosum L. · Potato

SLOOTS| R.H. Sloots

DE FI NL

7 records

PR39A98

Active

Zea mays L. · Maize

PIONEER HI-BRED INTERNATIONAL

BE DE SK

8 records

Rheingold

Terminated

Hordeum vulgare L. · Barley

SAATZUCHT JOSEF BREUN GmbH&Co.KG

DE FI LT

7 records

Rifle

Protection expired

Beta vulgaris Sugar Beet Group · Sugar beet

Societe Europeenne de Semences NV/SA (BE)

BG ES FR

5 records

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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.