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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.

Spartaco

Active

Solanum lycopersicum L. · Tomato

IT
1 record

Saladyn

Active

Solanum lycopersicum L. · Tomato

IT
1 record

Torpedo

Terminated

Solanum melongena L. · Eggplant

NL
1 record

Rossetto

Active

Solanum lycopersicum L. · Tomato

IT
1 record

Tauraso

Active

Solanum lycopersicum L. · Tomato

IT
1 record

SILETTA

Terminated

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

DK
1 record

Tera

Terminated

Solanum tuberosum L. · Potato

SK
1 record

Rosetano

Application submitted

hybrids between Solanum lycopersicum L. and S. habrochaites S. Knapp & D.M. Spooner

HU
1 record

Sharp

Active

Solanum sisymbriifolium Lam. · Sticky nightshade

NL
1 record

Senta

Terminated

Solanum tuberosum L. · Potato

IT
1 record

Roforto VFN

Terminated

Solanum lycopersicum L. · Tomato

NL
1 record

Sinja KWS

Withdrawn

Beta vulgaris Sugar Beet Group · Sugar beet

SE
1 record

SARIC

Terminated

Triticum aestivum L. · Bread wheat

ES
1 record

Rosantea

Active

Solanum lycopersicum L. · Tomato

IT
1 record

Primosa

Application submitted

Solanum lycopersicum L. · Tomato

HU
1 record

Pulsar

Active

Sinapis alba L. · White mustard

DE
1 record

Silco

Terminated

Solanum lycopersicum L. · Tomato

NL
1 record

Portanto

Terminated

Solanum lycopersicum L. · Tomato

NL
1 record

Revenge AF

Terminated

Solanum lycopersicum L. · Tomato

IT
1 record

Reem

Active

Solanum lycopersicum L. · Tomato

IT
1 record

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