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.

VVA-1

Active

Prunus tomentosa thunb x P. cerasifera

Krymsk Experiment Breeding Station

7 records

CN 99 113 1

Active

Solanum tuberosum L. · Potato

Station de Recherche du Comité Nord G.I.E.

6 records

Ras poly

Active

Beta vulgaris Sugar Beet Group · Sugar beet

Syngenta participation AG

FR IT SE

4 records

TY 12

Active

Solanum lycopersicum L. · Tomato

Rijk Zwaan Zaadteelt en Zaadhandel B.V.^^^Asahi Industries Co. Ltd.

NL UA

5 records

Hansen 2168

Active

Prunus amygdalus x Prunus persica

The Regents of the University of California

ES FR

5 records

NC 3

Active

Nicotiana tabacum L. · Tobacco

NORTH CAROLINA STATE UNIVERSITY

HU PL

4 records

Jag 8810

Active

Solanum lycopersicum L. · Tomato

Bayer Holland B.V.

NL UA

9 records

Hybriforce-2420/Wet

Active

Medicago sativa L. · Alfalfa

Velde Mike John

SI UA

7 records

Heinz 2206

Active

Solanum lycopersicum L. · Tomato

HEINZSEED

HR PT

5 records

Heinz 1301

Active

Solanum lycopersicum L. · Tomato

HEINZSEED

PT UA

4 records

ES 5200

Active

Sorghum bicolor (L.) Moench · Sorghum

Johnson, Clinton Jay

IT PT

4 records

S 18-11

Active

Glycine max (L.) Merr. · Soybean

Syngenta Seeds

4 records

Red Sun

Active

Solanum tuberosum L. · Potato

G&C SCHAT - FOBEK

7 records

GF 677

Active

Prunus amygdalus x Prunus persica

INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE-INRA

8 records

Heinz 1015

Active

Solanum lycopersicum L. · Tomato

HEINZSEED

4 records

BRS Sambaiba

Active

Glycine max (L.) Merr. · Soybean

MAURICIO CONRADO MEYER_ / LEONES ALVES DE ALMEIDA_ / ROMEU AFONSO DE SOUZA KIIHL_

4 records

Big Rossa

Active

Solanum tuberosum L. · Potato

Josef Schwarzfischer^^^Adolf Kellermann

5 records

Murasaki 29

Active

Ipomoea batatas (L.) Lam. · Sweet potato

LaBonte Don R.|Baton Rouge, LA, US / Villordon Arthur Q.|Monroe, LA, US / Clark Christopher A.|Baton Rouge, LA, US

4 records

'Densipac'

Active

Prunus besseyi x Prunus cerasifera Ehrh

Pinochet Jorge

6 records

Asterix

Active

Solanum tuberosum L. · Potato

ZPC Portugal

AT BE CZ DE DK EE +15

39 records

Liseta

Active

Solanum tuberosum L. · Potato

WIERSMA R.K.

BE CZ DK ES FR GR +9

36 records

Felsina

Active

Solanum tuberosum L. · Potato

SIMON BRUNIA

BE CZ DE DK ES FI +9

37 records

Agata

Active

Solanum tuberosum L. · Potato

W. WEIBULL B.V.I.O.

AT BE BG DE DK ES +9

29 records

Mondial

Active

Solanum tuberosum L. · Potato

VEREDELINGSBEDRIJF D. BIEMOND B.V.

AT BE CZ DK ES FR +7

35 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.