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.
Sinapis alba L. · White mustard
PHP PETERSEN
Solanum tuberosum L. · Potato
Teagasc Oak Park Research Centre
Solanum tuberosum L. · Potato
Station de Recherche du Comité Nord G.I.E.
Raphanus sativus L. var. oleiformis Pers. · Oil radish
Lammers Seed Options B.V.
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Solanum tuberosum L. · Potato
MTS BOERHAVE
Solanum tuberosum L. · Potato
Heinrich Böhm
Solanum lycopersicum L. · Tomato
Seminis Vegetable Seeds
Raphanus sativus L. var. oleiformis Pers. · Oil radish
VANDINTER SEMO B.V.
Sinapis alba L. · White mustard
J. Joordens' Zaadhandel B.V.
Sinapis alba L. · White mustard
ROBERTO GUARNIERI
Raphanus sativus L. var. oleiformis Pers. · Oil radish
J. Joordens' Zaadhandel B.V.
Solanum tuberosum L. · Potato
Germicopa Breeding S.A.S
Raphanus sativus L. var. oleiformis Pers. · Oil radish
VANDINTER SEMO B.V.
Solanum tuberosum L. · Potato
Johannes M.H. van den Oord
Sinapis alba L. · White mustard
J. Joordens' Zaadhandel B.V.
Trifolium pratense L. · Red clover
W WEIBULL
Solanum tuberosum L. · Potato
Teagasc
Sinapis alba L. · White mustard
PHP PETERSEN
Solanum lycopersicum L. · Tomato
Kees Konst
Raphanus sativus L. var. oleiformis Pers. · Oil radish
PHP PETERSEN
Solanum lycopersicum L. · Tomato
Kees Konst
Solanum lycopersicum L. · Tomato
Syngenta Seeds
Solanum tuberosum L. · Potato
Teagasc