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
Germicopa Breeding S.A.S
Solanum lycopersicum L. · Tomato
Syngenta Seeds B.V.
Raphanus sativus L. var. oleiformis Pers. · Oil radish
Feldsaaten Freudenberger GmbH&Co.KG
Solanum lycopersicum L. · Tomato
Steven Schroeder
Solanum tuberosum L. · Potato
NORIKA Nordring-Kartoffelzucht-und Vermehrungs-GmbH Gross Luesewitz
Solanum tuberosum L. · Potato
Station de Recherche du ComitÚ Nord
Solanum tuberosum L. · Potato
Wolfgang Walter, NORIKA-Nordring-Kartoffelzucht- und Vermehrungs-GmbH Gross Luesewitz
Beta vulgaris Sugar Beet Group · Sugar beet
Miroslaw Lakomy
Solanum tuberosum L. · Potato
Sudkartoffel GmbH
Solanum tuberosum L. · Potato
Justus Böhm
Solanum tuberosum L. · Potato
Justus Bohm
Solanum tuberosum L. · Potato
Lantmõnnen Seed B.V.
Sinapis alba L. · White mustard
Lammers Seed Options B.V.
Solanum tuberosum L. · Potato
Germicopa Breeding
Raphanus sativus L. var. oleiformis Pers. · Oil radish
PHP PETERSEN
Solanum tuberosum L. · Potato
Gisele Lairy-Joly
Sinapis alba L. · White mustard
SCHLATHoeLTER| Michaela Schlathoelter
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)
Solanum tuberosum L. · Potato
Walter DeJong, Cornell University
Solanum tuberosum L. · Potato
Walter DeJong, Cornell University
Solanum tuberosum L. · Potato
STET HOLLAND
Solanum tuberosum L. · Potato
STET HOLLAND
Solanum tuberosum L. · Potato
Kweek-en Researchbedrijf Agrico B.V., Netherlands
Tagetes L. · Marigold
T.J.P.G. van der Heijden