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.
Glycine max (L.) Merr. · Soybean
UNIVERSITY OF MINNESOTA
Solanum lycopersicum L. · Tomato
Jean Clause Mercier
Solanum lycopersicum L. · Tomato
Johannes Barten
Beta vulgaris Sugar Beet Group · Sugar beet
KWS| KWS SAAT AG
Beta vulgaris Sugar Beet Group · Sugar beet
Maribo Seed International ApS
Prunus domestica L. · European plum
INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR
Capsicum annuum L. · Bell pepper
RAMIRO ARNEDO, S.A.
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Capsicum annuum L. · Bell pepper
Syngenta Crop Protection AG
Solanum tuberosum L. · Potato
Instytut kartopliarstva Natsionalnoi akademii ahrarnykh nauk Ukrainy
Lactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Solanum lycopersicum L. · Tomato
HAZERA GENETICS
Solanum lycopersicum L. · Tomato
Rijk Zwaan France SARL (FR)
Solanum lycopersicum L. · Tomato
Mercier Jean-Claude
Brassica napus var. napus · Rapeseed
DEUTSCHE SAATVEREDELUNG AG
Sorghum x drummondii (Steud.) Millsp. & Chase · Sudangrass
DESERT SUN MARKETING COMPANY INC
Solanum lycopersicum L. var. lycopersicum · Tomato
NIRIT SEEDS
Solanum lycopersicum L. · Tomato
Khenkuet Rene
Raphanus sativus L. var. oleiformis Pers. · Oil radish
Michaela Schlathölter
Tagetes L. · Marigold
Ing. Piet Lammers
Solanum lycopersicum L. · Tomato
Axia NL B.V.
Solanum tuberosum L. · Potato
Walter Wallmuller (DE)
Capsicum annuum L. · Bell pepper
RAMIRO ARNEDO, S.A.
Capsicum annuum L. · Bell pepper
Rijk Zwaan Zaadteelt en Zaadhandel B.V.