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 lycopersicum L. · Tomato
Bayer Holland B.V.
Medicago sativa L. · Alfalfa
Florimond Desprez Veuve et Fils, FR
Solanum tuberosum L. · Potato
Lars Naested
Phacelia tanacetifolia Benth. · Lacy phacelia
Ing. Piet Lammers
Solanum lycopersicum L. · Tomato
TOMAS DAVID LOMAS CANO
Solanum lycopersicum L. · Tomato
Kees Konst
hybrids between Solanum lycopersicum L. and S. habrochaites S. Knapp & D.M. Spooner
Rijk Zwaan Zaadteelt en Zaadhandel B.V. (NL)
Solanum lycopersicum L. · Tomato
Paul Degreef
Solanum lycopersicum L. · Tomato
SEMILLAS FITO, S.A.
Raphanus sativus L. var. oleiformis Pers. · Oil radish
VANDINTER RESEARCH B.V.
Capsicum annuum L. · Bell pepper
Enza Zaden Beheer B.V.
Raphanus sativus L. var. oleiformis Pers. · Oil radish
Carneau Freres SA (FR)
Oryza sativa L. · Rice
EN.N.RISI
Raphanus sativus L. var. oleiformis Pers. · Oil radish
Michaela Schlathölter
Solanum tuberosum L. · Potato
Saatzucht Hergen Berding
Raphanus sativus L. var. oleiformis Pers. · Oil radish
P.H. Petersen Saatzucht Lundsgaard GmbH Herrn Asmus Sören Petersen
Solanum tuberosum L. · Potato
Instytut Hodowli i Aklimatyzacji Roslin Panstwowy Instytut Badawczy
Sinapis alba L. · White mustard
VANDINTER SEMO B.V.
Sinapis alba L. · White mustard
VANDINTER RESEARCH B.V.
Solanum tuberosum L. · Potato
Johannes Martinus Kannegieter (J.M. Kannegieter)
Sinapis alba L. · White mustard
VANDINTER RESEARCH B.V.
Raphanus sativus L. var. oleiformis Pers. · Oil radish
Ir. Hervé de Clercq c/o ILVO - Plant-Toegepaste Genetica en Veredeling
Sinapis alba L. · White mustard
Carneau Freres SA (FR)
Beta vulgaris Sugar Beet Group · Sugar beet
STRUBE D and S GMBH