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.

Belana

Active

Solanum tuberosum L. · Potato

Hergen Berding

CZ DE LU SK UA

13 records

Bettina

Active

Solanum tuberosum L. · Potato

Nordostbayer. Saatbauverband GmbH

AT CZ DE HR SI

10 records

Rubinia

Active

Solanum tuberosum L. · Potato

Potato Seed Solutions

AT ES FR NL

17 records

Borwina

Active

Solanum tuberosum L. · Potato

Wolfgang Walter

DE HR LT LU

10 records

Tiger

Active

Solanum tuberosum L. · Potato

R.P.GRAVELAND

FR NL UA

14 records

Red Anna

Active

Solanum tuberosum L. · Potato

VIKTOR KOPACKA

CZ SK UA

13 records

Kiebitz

Active

Solanum tuberosum L. · Potato

Wolfgang Walter

DE HR UA

13 records

Florence

Active

Hordeum vulgare L. · Barley

UNISIGMA

IE LT PL

17 records

Galaxie

Active

Medicago sativa L. · Alfalfa

Vincent Beguier

AT FR UA

11 records

Anuschka

Active

Solanum tuberosum L. · Potato

Kartoffelzucht Böhm Inh. Gebrüder Böhm K.G.

AT LU UA

11 records

Saphire

Active

Solanum tuberosum L. · Potato

Van Rijn Group

NL UA

13 records

Ronaldo

Active

Solanum tuberosum L. · Potato

Ytzen Pieter van der Werff

NL UA

14 records

Ricarda

Active

Solanum tuberosum L. · Potato

SAKA| SaKa Pflanzenzucht GmbH & Co. KG

DE UA

15 records

Queen Anne

Active

Solanum tuberosum L. · Potato

Solana, D

DE UA

14 records

Paroli

Active

Solanum tuberosum L. · Potato

WOLFGANG Walter, DE

DE UA

12 records

Malou

Active

Solanum tuberosum L. · Potato

Germicopa SAS, FR

FR PT

12 records

Lucinda

Active

Solanum tuberosum L. · Potato

Maurice Schehr c/o HZPC Holland B.V.

NL UA

14 records

Loane

Active

Solanum tuberosum L. · Potato

GERMICOPA SAS

MT PT

11 records

Karelia

Active

Solanum tuberosum L. · Potato

Heinrich Böhm

DE UA

11 records

Ivetta

Active

Solanum tuberosum L. · Potato

MOELLER| Dr. Karl Heinz Moeller im Institut f.Kartoffelforschung- Abt. Kartoffelzuechtung - / PAPENHAGEN| Dr. Friedrich Papenhagen / TAENDLER| Dr. Karl Taendler

DE LU

13 records

Laudine

Active

Solanum tuberosum L. · Potato

NIEDEROSTERREICHISCHE SAATBAUGENOSSENSCHAFT, AT

NL UA

12 records

Edison

Active

Solanum tuberosum L. · Potato

SOLANA GMBH & CO KG

NL UA

12 records

Connect

Active

Solanum tuberosum L. · Potato

Jacob Eising

NL UA

12 records

Divaa

Active

Solanum tuberosum L. · Potato

Jan Boer

MT NL

11 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.