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.

Medicus

Active

Sinapis alba L. · White mustard

Werner Horn

CZ DE DK HU

8 records

Maris Piper

Active

Solanum tuberosum L. · Potato

P.BREED.INT.CAMBRIDGE

ES IE IT NL

9 records

Marino

Active

Beta vulgaris Sugar Beet Group · Sugar beet

Maribo Seed International ApS

DK ES UA

8 records

Josephina KWS

Active

Beta vulgaris Sugar Beet Group · Sugar beet

KWS SAAT SE and CO KGAA

DE DK FR SE

6 records

Franca

Active

Solanum tuberosum L. · Potato

NIEDERS KARTOFFELZ

DE DK ES NL

11 records

Fortnox

Active

Beta vulgaris Sugar Beet Group · Sugar beet

Syngenta Participations AG

BE LT NL SE

6 records

Exquisa

Active

Solanum tuberosum L. · Potato

SAATZUCHT FIRLBECK GMBH and CO KG

AT DE FR NL

9 records

Dominik

Active

Avena sativa L. · Oat

BERTHOLD BAUER

CZ DE EE LT

8 records

Calida

Terminated

Beta vulgaris Sugar Beet Group · Sugar beet

KWS SAAT SE and CO KGAA

DE ES FR NL

7 records

Diabolo

Active

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

VANDIJKE SEMP

BE DE FR NL

9 records

Chibli

Active

Solanum lycopersicum L. · Tomato

Syngenta Seeds B.V. (NL)

BG HR NL

7 records

Belladonna KWS

Active

Beta vulgaris Sugar Beet Group · Sugar beet

KWS Saat AG, DE

DE DK FR NL

6 records

Concerta

Active

Sinapis alba L. · White mustard

Paul Baecker

CZ DE NL PL

10 records

Activa

Active

Lolium perenne L. · Perennial ryegrass

VANDINTER SEMO B.V.

DE FR LU NL

9 records

Amati

Active

Solanum lycopersicum L. · Tomato

Seminis Vegetable Seeds

BG HR NL PL

7 records

Biogold

Application submitted

Solanum tuberosum L. · Potato

VAN RIJN-KWS B.V.

NL UA

9 records

Triplo

Active

Solanum tuberosum L. · Potato

STET HOLLAND

GR HR NL

10 records

White Lady

Active

Solanum tuberosum L. · Potato

University of Pannonia,Potato Research Centre (HU)

HR HU SI

8 records

Venice

Active

Sinapis alba L. · White mustard

VANDINTER RESEARCH B.V.

DE FR NL

9 records

Triangel

Active

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

J. Joordens' Zaadhandel B.V. Herrn P.J.H.G. Packbier

DE FR NL

9 records

Toro

Active

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

SEMILLAS FITO SAU

DE HR SI

8 records

ST Congo

Active

Beta vulgaris Sugar Beet Group · Sugar beet

STRUBE D and S GMBH

DE FR SE

6 records

Signal

Active

Sinapis alba L. · White mustard

SAATZUCHT| Saatzucht Steinach GmbH & Co KG

AT DE FR

7 records

Rioja

Protection expired

Solanum tuberosum L. · Potato

University of Pannonia,Potato Research Centre (HU)

HR HU SI

8 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.