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
Wolfgang Walter
Solanum tuberosum L. · Potato
Station de Recherche du Comité Nord G.I.E.
Medicago sativa L. · Alfalfa
Barenbrug Holland BV (NL)
Solanum tuberosum L. · Potato
Wolfgang Walter
Solanum tuberosum L. · Potato
Sjefke Allefs
Solanum tuberosum L. · Potato
Lantmännen Seed B.V.
Solanum tuberosum L. · Potato
Bavaria Saat GbR
Solanum tuberosum L. · Potato
Germicopa Breeding, F
Solanum tuberosum L. · Potato
SOLANA SEEDS UNITED KINGDOM LTD. UNIT 4
Solanum tuberosum L. · Potato
Peter Leonard Oldenkamp
Solanum lycopersicum L. · Tomato
STEFANO CARLI
Capsicum annuum L. · Bell pepper
Lindeman Wouter
Solanum tuberosum L. · Potato
Jack Dunnett
Solanum tuberosum L. · Potato
Wolfgang Walter
Sinapis alba L. · White mustard
PHP PETERSEN
Solanum lycopersicum L. · Tomato
Monsanto Vegetable, NL
Solanum tuberosum L. · Potato
Heinrich Böhm
Solanum tuberosum L. · Potato
PLANTERA SEED BV
Pisum sativum L. · Pea
Limagrain UK
Solanum tuberosum L. · Potato
Kweek-en Researchbedrijf Agrico B.V., Netherlands
Solanum tuberosum L. · Potato
Wolfgang Walter
Solanum lycopersicum L. · Tomato
NUNHEMS B.V., BASF Quimica Colombiana S.A.
Solanum lycopersicum L. · Tomato
Syngenta Seeds B.V.
Solanum tuberosum L. · Potato
Winfried Lange, Frank Lange