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.

Tamino

Active

Solanum tuberosum L. · Potato

Saka Pflanzenzucht GmbH Co KG

5 records

Tangra

Active

Solanum lycopersicum L. · Tomato

Vilmorin SA (FR)

3 records

Terraplus

Active

Brassica juncea (L.) Czern. · Brown mustard

P.H. Petersen Saatzucht Lundsgaard GmbH Herrn Asmus Sören Petersen / Michaela Schlathölter

4 records

Tabantha

Active

Solanum lycopersicum L. · Tomato

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

5 records

SVTM9034

Active

Solanum lycopersicum L. · Tomato

Seminis Vegetable Seeds

3 records

SVTM9032

Active

Solanum lycopersicum L. · Tomato

Seminis Vegetable Seeds

4 records

SVPP1876

Active

Capsicum annuum L. · Bell pepper

Monsanto Vegetable, NL

5 records

Talavante

Application submitted

Solanum lycopersicum L. · Tomato

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

4 records

Sunstream Heaven

Application submitted

Solanum lycopersicum L. · Tomato

Enza Zaden Beheer B.V.

4 records

Tatoo

Application submitted

Solanum lycopersicum L. · Tomato

Syngenta Crop Protection AG

4 records

Swing

Active

Solanum tuberosum L. · Potato

NORIKA Nordring- Kartoffelzucht- und Ver

5 records

Supporter

Active

Solanum tuberosum L. · Potato

Sloots Aardappelkweekbedrijf B.V.

5 records

SVTM9033

Active

Solanum lycopersicum L. · Tomato

Seminis Vegetable Seeds

4 records

Stratos

Active

Solanum tuberosum L. · Potato

Sloots Aardappelkweekbedrijf B.V.

5 records

ST Stromboli

Active

Beta vulgaris Sugar Beet Group · Sugar beet

STRUBE D&S GmbH, DE

3 records

Stronga

Active

Solanum tuberosum L. · Potato

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

4 records

Stacey

Active

Solanum tuberosum L. · Potato

Lantmõnnen Seed B.V.

5 records

Starlisher

Application submitted

Solanum lycopersicum L. · Tomato

Bayer Holland B.V.

4 records

Strabelina

Application submitted

Solanum lycopersicum L. · Tomato

Bayer Holland B.V.

4 records

Spartus

Active

Solanum lycopersicum L. · Tomato

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

5 records

Solo

Active

Solanum tuberosum L. · Potato

Bavaria Saat GbR

4 records

Stabilo

Active

Solanum tuberosum L. · Potato

Roelof H. Sloots

5 records

Steinacher Weissklee

Terminated

Trifolium repens L. · White clover

BAYWA AG| BayWa Aktiengesellschaft

3 records

Structura

Terminated

Hordeum vulgare L. · Barley

GROSSER| Dr. Joerg Grosser in Fa. KWS LOCHOW GMBH - Zuchtstation Wetze -

4 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.