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.

Safrane

Active

Solanum tuberosum L. · Potato

Institut National de Recherche pour l'Agriculture l'Alimentation et l'Environnement (INRAE)

BG ES FR

8 records

Runner

Active

Solanum lycopersicum L. · Tomato

SEMILLAS FITO, S.A.

ES NL PL

6 records

Romeo

Active

Solanum lycopersicum L. · Tomato

Petoseed Co INC (US)

CZ FR NL

5 records

Pr55v48

Active

Medicago sativa L. · Alfalfa

Tomasich Josef

BG RO UA

8 records

Remonta

Protection expired

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

Dr. Hans Baukloh in Fa. KWS SAAT SE

CZ DE NL

7 records

Pauletta

Active

Beta vulgaris Sugar Beet Group · Sugar beet

KWS Saat AG, DE

DE FR NL

6 records

Oceania

Application submitted

Solanum tuberosum L. · Potato

Joseph le Berre

FR IT UA

7 records

Newton

Active

Solanum lycopersicum L. · Tomato

Syngenta Seeds B.V.

FR NL PL

6 records

Musette

Active

Medicago sativa L. · Alfalfa

Florimond Desprez Veuve et Fils, FR

FI FR NL

8 records

Maximus

Active

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

ILVO-PLANT 39

BE DE NL

5 records

Montrose

Active

Avena sativa L. · Oat

Lantmõnnen ek f÷r Plant Breeding department

EE LT NL

7 records

NOS Lollipop

Active

Hordeum vulgare L. · Barley

Nordic Seed A/S

CZ DK PL

6 records

Martigena

Active

Sinapis alba L. · White mustard

KWS SAAT SE & CO.KGAA

DE NL PL

6 records

Matias

Active

Solanum lycopersicum L. · Tomato

Johannes Barten

HR NL UA

6 records

Lido

Active

Oryza sativa L. · Rice

SISFORAGGERA

ES IT PT

9 records

KOMPOLTI HIBRID T.C.

Active

Cannabis sativa L. · Hemp

HR HU SI

5 records

Jorba

Active

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

VANDINTER SEMO B.V.

DE FR NL

7 records

Krasa

Active

Solanum tuberosum L. · Potato

Sativa Keřkov a.s., CZ

CZ PL SK

8 records

Elsabella KWS

Active

Beta vulgaris Sugar Beet Group · Sugar beet

KWS SAAT SE&CO.KGaA, DE

BE DE FR

5 records

Evita

Active

Solanum tuberosum L. · Potato

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

AT CZ EE

11 records

Fabiola

Active

Solanum tuberosum L. · Potato

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

AT HR NL

6 records

Durbel

Active

Triticum durum Desf. · Durum wheat

SEMILLAS FITO' S.A.

ES IT PT

9 records

Camilla

Terminated

Beta vulgaris Sugar Beet Group · Sugar beet

KWS SAAT SE and CO KGAA

DK NL SE

5 records

Comet

Active

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

PHP PETERSEN

DE NL

8 records

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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.