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.
hybrids between Solanum lycopersicum L. and S. habrochaites S. Knapp & D.M. Spooner
Rijk Zwaan Zaadteelt & Zaadhandel B.V.
Solanum tuberosum L. · Potato
Winfried Lange, Frank Lange, Lange Wolf
Raphanus sativus L. var. oleiformis Pers. · Oil radish
Lammers Seed Options B.V.
Solanum tuberosum L. · Potato
Vesa Velhartice a.s.
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)
Solanum tuberosum L. · Potato
Grocep S.I.C.A.
Solanum lycopersicum L. · Tomato
Sakata Vegenetics (Pty) Ltd (ZA)/Sakata Seed Sudamerica Ltd (BR)
Solanum tuberosum L. · Potato
Bretagne-Plants S.C.I.C.A.
Capsicum annuum L. · Bell pepper
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Cucumis melo L. · Melon
Domaine Public (FR)
Solanum lycopersicum L. · Tomato
Cora Seeds SRL, I
Solanum tuberosum L. · Potato
Bretagne-Plants S.C.I.C.A.
Solanum lycopersicum L. · Tomato
Clause Vegetable Seeds
Oryza sativa L. · Rice
ENTE NAZIONALE RISI
Raphanus sativus L. var. oleiformis Pers. · Oil radish
PHP PETERSEN
Raphanus sativus L. var. oleiformis Pers. · Oil radish
Carneau Freres SA (FR)
Solanum tuberosum L. · Potato
CALEDONIA POTATO HOLDINGS LTD
Solanum tuberosum L. · Potato
Station de Recherche du Comité Nord G.I.E.
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)
Sinapis alba L. · White mustard
Carneau Freres SA (FR)
Solanum tuberosum L. · Potato
Bretagne-Plants S.C.I.C.A.
Solanum tuberosum L. · Potato
Germicopa Breeding S.A.S
Solanum tuberosum L. · Potato
Germicopa SAS, FR
Solanum lycopersicum L. · Tomato
Sakata Seed Corporation, JP