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.

Inca Rosa

Active

Solanum tuberosum L. · Potato

JAMES HUTTON LTD

3 records

GRN1

Active

Vitis rotundifolia x Vitis rupestris

Andrew Walker, Harold P. Olmo

2 records

GARNEM

Active

Prunus x persicoides (Ser.) M. Vilm. & Bois · Peach x Almond

Centro de Investigacion y Tecnologia Agroalimentaria (ES)

2 records

Eir

Active

Solanum tuberosum L. · Potato

Graminor AS, N-2322 Ridabu

2 records

Dohkko

Active

Solanum lycopersicum x Solanum pimpinellifolium · Tomato

Syngenta Crop Protection AG

2 records

Charlemont

Terminated

Solanum tuberosum L. · Potato

Agri-food and Biosciences Institute (AFBI Belfast)

2 records

Buchan

Terminated

Solanum tuberosum L. · Potato

SCOTTISH CROP RESEARCH INSTITUTE

3 records

Blush

Terminated

Solanum tuberosum L. · Potato

SCOTTISH CROP RESEARCH INSTITUTE

2 records

Beate

Active

Solanum tuberosum L. · Potato

Landbruks- og matdepartementet, N - 0030 Oslo

2 records

Bambino

Active

Solanum tuberosum L. · Potato

CYGNET POTATO BREEDERS

3 records

2705849

Application submitted

Glycine max (L.) Merr. · Soybean

Benson Hill Seeds Inc.

2 records

Bayou Belle

Active

Ipomoea batatas (L.) Lam. · Sweet potato

Christopher A. Clark^^^Tara Smith^^^Arthur Q. Villordon^^^Don R. LaBonte

2 records

Alpine

Active

Prunus persica (L.) Batsch · Peach

ARC INFRUTEC

3 records

Andeana

Active

Solanum tuberosum L. · Potato

JAMES HUTTON LTD

3 records

Amour

Active

Solanum tuberosum L. · Potato

SCOTTISH CROP RESEARCH INSTITUTE

2 records

Vitara

Active

Solanum lycopersicum L. · Tomato

SEMILLAS FITO, S.A.

2 records

Santasty

Active

Solanum lycopersicum L. · Tomato

Enza Zaden Beheer B.V.

4 records

Mesilla

Active

Capsicum annuum L. · Bell pepper

Bayer Holland B.V.

2 records

Lysimax

Terminated

Hordeum vulgare L. · Barley

SEJET PLANTEFORÆDLING

3 records

Hokkaido

Active

Capsicum annuum L. · Bell pepper

Syngenta Crop Protection AG

4 records

Corrado

Terminated

Avena sativa L. · Oat

SEJET PLANTEFORÆDLING

3 records

ID-2181

Terminated

Triticum aestivum L. · Bread wheat

CSIC/UPM/IRTA

2 records

ID 2150

Terminated

Triticum aestivum L. · Bread wheat

IRTA/UPM/CSIC/EUROSEMILL.

2 records

Mirared 1

Withdrawn

Prunus cerasifera Ehrh. x P. persica (L.) Batsch · Myrobalan x Peach

Nova S.r.l.

1 record

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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.