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.
Solanum tuberosum L. · Potato
VEREINIGTE SAATZUCHTEN EBSTORF-ROSCHE
Beta vulgaris Sugar Beet Group · Sugar beet
KWS Saat SE Finanzbuchhaltung
Solanum lycopersicum L. · Tomato
Syngenta Seeds BV (NL)
Beta vulgaris Sugar Beet Group · Sugar beet
Betaseed GmbH (DE)
Solanum lycopersicum L. · Tomato
HM.CLAUSE
Beta vulgaris Sugar Beet Group · Sugar beet
STRUBE GmbH&Co.KG, DE
Solanum melongena L. · Eggplant
CLAUSE, S.A.
Beta vulgaris Sugar Beet Group · Sugar beet
Henning Friehe
Solanum lycopersicum L. · Tomato
PanAmerican Seed Co.
Beta vulgaris Sugar Beet Group · Sugar beet
Betaseed
Solanum lycopersicum L. · Tomato
Zeraim Gedera Ltd. Seed Company
Triticum durum Desf. · Durum wheat
Groupement Agricole Essonnois (FR)
Solanum tuberosum L. · Potato
Heinrich Böhm
Chrysanthemum L. · Chrysanthemum
Vandenberg Cornelis P.|Salinas, CA
Raphanus sativus L. var. oleiformis Pers. · Oil radish
VANDINTER RESEARCH B.V.
Solanum tuberosum L. · Potato
Niederösterreichische Saatbaugenossenschaft reg.Gen.m.b.H.
Prunus fruticosa x Prunus serrulata
Provorchenko Oleksandr volodymyrovych, Podorozhnii Volodymyr Mykolaiovych, Yer`omin Hennadii Viktorovych,
Hordeum vulgare L. · Barley
Lantmännen SW Seed
Lotus corniculatus L. · Bird's-foot trefoil
ARIO University of Guelph (CA)
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE and CO KGAA
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)
Solanum tuberosum L. · Potato
Vesa Velhartice a.s., CZ
Sorghum x drummondii (Steud.) Millsp. & Chase · Sudangrass
Northrup King Semences SA (FR)
Raphanus sativus L. var. oleiformis Pers. · Oil radish
VANDINTER RESEARCH B.V.