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
Robert Plaisted, Cornell University Agricultural Experiment Station
Solanum lycopersicum L. · Tomato
GRAINES GAUTIER, S.A.
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE & CO.KGAA
Solanum lycopersicum L. · Tomato
HM.CLAUSE
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE & CO.KGAA
Solanum lycopersicum L. · Tomato
Syngenta Seeds B.V.
Lolium multiflorum Lam. · Italian ryegrass
RUDLOFF CHRISTOPHER| Christopher Rudloff
Solanum lycopersicum L. · Tomato
Nunhems B.V.
Solanum lycopersicum L. · Tomato
Syngenta Crop Protection AG
Beta vulgaris Sugar Beet Group · Sugar beet
Hilleshog AB (SE)
Solanum lycopersicum L. · Tomato
Rene Khenkuet
Solanum lycopersicum L. · Tomato
Vilmorin SA (FR)
Capsicum annuum L. · Bell pepper
Moshe Zalsman
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Beta vulgaris Sugar Beet Group · Sugar beet
SESVanderHave N.V./S.A. (BE)
Solanum lycopersicum L. · Tomato
ROYAL SLUIS
Solanum lycopersicum L. · Tomato
Michael Edwin Kuehn
Beta vulgaris Sugar Beet Group · Sugar beet
KWS| KWS SAAT AG
Beta vulgaris Sugar Beet Group · Sugar beet
SESVANDERHAVE NV-SA, BE
Solanum lycopersicum L. · Tomato
Johannes Barten
Beta vulgaris Sugar Beet Group · Sugar beet
Betaseed
Beta vulgaris Sugar Beet Group · Sugar beet
Betaseed Inc. (US)
Solanum lycopersicum L. · Tomato
Syngenta Seeds B.V.
Beta vulgaris Sugar Beet Group · Sugar beet
Betaseed