Pests
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.
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.
Capsicum annuum L. · Bell pepper
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Solanum tuberosum L. · Potato
Bretagne-Plants S.C.I.C.A.
Allium sativum L. · Garlic
Unisem Drom Gie (FR)
Solanum lycopersicum L. · Tomato
Syngenta Crop Protection AG
Solanum lycopersicum L. · Tomato
Sakata Seed Corporation (SCC)
Solanum lycopersicum L. · Tomato
Sakata Vegetables Europe, F
Capsicum annuum L. · Bell pepper
HM.Clause S.A.S.
Solanum tuberosum L. · Potato
Pomorsko Mazurska Hodowla Ziemniaka Sp.z o.o. z siedziba w Strzekecinie
Solanum tuberosum L. · Potato
Teagasc Crops Research Department
Solanum lycopersicum L. · Tomato
TAKII & CO LTD
Zea mays L. · Maize
Pioneer Overseas Corporation, Pioneer Hi-Bred International Inc.
Beta vulgaris Sugar Beet Group · Sugar beet
Sesvanderhave, B
Capsicum annuum L. · Bell pepper
Seminis Vegetable Seeds
Beta vulgaris Sugar Beet Group · Sugar beet
SESVANDERHAVE NV-SA, BE
Brassica juncea (L.) Czern. · Brown mustard
OSEVA PRO s.r.o., CZ
Capsicum annuum L. · Bell pepper
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Glycine max (L.) Merr. · Soybean
UNIVERSITY OF GUELPH
Raphanus sativus L. var. oleiformis Pers. · Oil radish
Plant Research (NZ) Ltd (NZ)
Solanum tuberosum L. · Potato
Department of Agriculture for Northern Ireland Dundonald House
Vitis L. · Grapevine
Institut National de Recherche pour l'Agriculture l'Alimentation et l'Environnement (INRAE)
Solanum tuberosum L. · Potato
Station de Recherche du Comite Nord (FR)
Solanum tuberosum L. · Potato
Station de Recherche du Comité Nord G.I.E.
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Solanum tuberosum L. · Potato
NORIKA Nordring- Kartoffelzucht- und Ver