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.
Beta vulgaris Sugar Beet Group · Sugar beet
SESVanderhave NV
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE & CO.KGAA
Solanum tuberosum L. · Potato
Wolfgang Walter
Sinapis alba L. · White mustard
P.H. Petersen Saatzucht Lundsgaard GmbH Herrn Asmus Sören Petersen / Michaela Schlathölter
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE and CO KGAA
Beta vulgaris Sugar Beet Group · Sugar beet
SESVanderHave N.V./S.A.
Capsicum annuum L. · Bell pepper
PETOSEED CO
Solanum tuberosum L. · Potato
STET HOLLAND
Solanum lycopersicum L. · Tomato
Hazera Genetics, IL
Solanum tuberosum L. · Potato
SCICA BRETAGNE- PLANTS
Solanum lycopersicum L. · Tomato
Syngenta Seeds B.V.
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Raphanus sativus L. var. oleiformis Pers. · Oil radish
VANDINTER RESEARCH B.V.
hybrids between Solanum lycopersicum L. and S. habrochaites S. Knapp & D.M. Spooner
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Beta vulgaris Sugar Beet Group · Sugar beet
SESVanderHave N.V./S.A.
Solanum lycopersicum L. · Tomato
SVR, ZAF
Phaseolus vulgaris L. · Common bean
VAN DER PLOEG'S (NL)
Solanum lycopersicum L. · Tomato
Sakata Seed Southern Africa Ltd (ZA)
Sinapis alba L. · White mustard
VANDINTER SEMO B.V.
Capsicum annuum L. · Bell pepper
Enza Zaden, NL
Solanum lycopersicum L. · Tomato
Monsanto Holland BV (NL)
Raphanus sativus L. var. oleiformis Pers. · Oil radish
VANDINTER SEMO B.V.
Raphanus sativus L. var. oleiformis Pers. · Oil radish
Gerard H.M. Bremer
Solanum tuberosum L. · Potato
Vandel Potatoes I/S c/o Danespo A/S