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.
Oryza sativa L. · Rice
TECNORISI, ASSISTENCIA TECNICA E COMERCIO DE SEMENTES LD.ª
Sinapis alba L. · White mustard
PHP PETERSEN
Solanum lycopersicum L. · Tomato
Syngenta Seeds B.V.
Medicago sativa L. · Alfalfa
Tom Damin, Pasture Genetics Pty Ltd
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)
Capsicum annuum L. · Bell pepper
Enza Zaden Beheer B.V.
Solanum tuberosum L. · Potato
Justus Böhm
hybrids between Solanum lycopersicum L. and S. habrochaites S. Knapp & D.M. Spooner
Syngenta Seeds B.V.
Helianthus annuus L. · Sunflower
Interstate Seed Co.
Solanum tuberosum L. · Potato
Fobek B.V./A. de Nijs & Zonen. BV/Handelmaatschappij Pars B.V.
Solanum lycopersicum L. · Tomato
Seminis Vegetable Seeds
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Medicago sativa L. · Alfalfa
CSIRO TROPICAL AGRICULTURE
Vitis L. · Grapevine
Andrew Walker
Solanum lycopersicum L. · Tomato
Seminis Vegetable Seeds
Oryza sativa L. · Rice
ALMO S.R.L.
Sinapis alba L. · White mustard
P.H. Petersen Saatzucht Lundsgaard GmbH Herrn Asmus Sören Petersen / Michaela Schlathölter
Raphanus sativus L. var. oleiformis Pers. · Oil radish
PHP PETERSEN
Brassica juncea (L.) Czern. · Brown mustard
SENOVA LTD
Solanum tuberosum L. · Potato
Gisele Lairy-Joly
hybrids between Solanum lycopersicum L. and S. habrochaites S. Knapp & D.M. Spooner
Vilmorin-Mikado S.A.S.
Sinapis alba L. · White mustard
P.H PETERSEN
Solanum lycopersicum L. · Tomato
HM.CLAUSE