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.

Verona

Active

Solanum tuberosum L. · Potato

UNIPLANTA| Uniplanta - Saatzucht KG

CZ DE NL PL

19 records

Salvo

Protection expired

Sinapis alba L. · White mustard

Van der Have B.V.

CZ DE NL PL

9 records

Sava

Active

Solanum tuberosum L. · Potato

Landbrugets Kartoffelfond, Foraedlst., DK-7184 Vandel

DK NL PL SE

10 records

Renova

Protection expired

Trifolium pratense L. · Red clover

Eidgen. Forschungsanstalt für Agrarökologie und Landbau Zürich-Reckenholz

AT DE EE ES

7 records

Ezra

Active

Glycine max (L.) Merr. · Soybean

Semences Prograin, CAN

AT HR HU UA

11 records

Gracja

Active

Sinapis alba L. · White mustard

Poznanska Hodowla Roslin Sp. z o.o

CZ DE PL UA

9 records

Estima

Active

Solanum tuberosum L. · Potato

SELECTIEBEDRIJF LUIDENBURG BV

FR IE IT NL

11 records

Applaus

Active

Hordeum vulgare L. · Barley

Sejet Planteforµdling I/S

DE DK NL PL

11 records

Avimag

Active

Prunus persica (L.) Batsch · Peach

JEAN-CLAUDE BOUSSET|ELISABETH KALLAY

ES FR HU IT

8 records

Anaïs

Active

Solanum tuberosum L. · Potato

GROCEP SICA

BG FR HR MT

11 records

Braco

Active

Sinapis alba L. · White mustard

DLF-TRIFOLIUM A/S

AT DK EE LT

9 records

Cara

Active

Solanum tuberosum L. · Potato

Teagasc

ES IE LU MT

11 records

Avanti

Active

Solanum tuberosum L. · Potato

STET Holland B.V.

FR IT NL

11 records

Royata KWS

Active

Solanum tuberosum L. · Potato

Peter Leonard Oldenkamp

HR NL UA

10 records

Romera

Active

Solanum tuberosum L. · Potato

Solana Agrar Proukte GmBH & Co.

DE HR IT

8 records

Sunshine

Active

Solanum tuberosum L. · Potato

Solana, D

FR NL UA

10 records

Mustang

Active

Solanum tuberosum L. · Potato

NIEDEROSTERREICHISCHE SAATBAUGENOSSENSCHAFT, AT

HR NL UA

13 records

Mercedes

Active

Medicago sativa L. · Alfalfa

Limagrain Genetics Grandes Cultures SA (FR)

AT FR NL

9 records

Melanie

Active

Solanum tuberosum L. · Potato

Grocep (FR)

DE FR NL

11 records

Marta

Active

Solanum tuberosum L. · Potato

SOLANA SEEDS UNITED KINGDOM LTD. UNIT 4

CZ DE PL

10 records

Fakse

Active

Solanum tuberosum L. · Potato

Landbrugets Kartoffelfond, Foraedlst., DK-7184 Vandel

DK EE PL

10 records

Elodie

Active

Solanum tuberosum L. · Potato

JEAN MARC ABHIVEN_

BG FR UA

8 records

Bellini

Active

Solanum tuberosum L. · Potato

Stet Holland BV (NL)

HR NL SI

10 records

Adretta

Active

Solanum tuberosum L. · Potato

NORIKA NORDRING-KARTOFFELZUCHTUND VERMEHRUNGS GmbH

DE LV SK

9 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.