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.
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE and CO KGAA
Solanum lycopersicum L. · Tomato
Jean-Christophe Lepeltier
Solanum lycopersicum L. · Tomato
Paul Degreef
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Solanum lycopersicum L. · Tomato
Paul Degreef
Beta vulgaris Sugar Beet Group · Sugar beet
SESVanderhave NV
Raphanus sativus L. var. oleiformis Pers. · Oil radish
Paul Baecker / Michaela Schlathölter
Hordeum vulgare L. · Barley
EWERTSON/LUNDIN
Solanum tuberosum L. · Potato
Bretagne-Plants S.C.I.C.A.
Solanum lycopersicum L. · Tomato
Kees Konst
Solanum lycopersicum L. · Tomato
Seminis Vegetable Seeds
Sinapis alba L. · White mustard
VANDINTER RESEARCH B.V.
Sinapis alba L. · White mustard
Carneau Freres SA (FR)
Phacelia tanacetifolia Benth. · Lacy phacelia
Pietrzak sp. z o.o. sp. k.
Solanum lycopersicum L. · Tomato
Syngenta Seeds B.V.
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Solanum lycopersicum L. · Tomato
Paul Degreef
Solanum tuberosum L. · Potato
Landbrugets Kartoffelfond, Foraedlst., DK-7184 Vandel
Raphanus sativus L. var. oleiformis Pers. · Oil radish
ILVO Plant
Solanum tuberosum L. · Potato
SCICA BRETAGNE- PLANTS
Raphanus sativus L. var. oleiformis Pers. · Oil radish
RAGT 2n
Solanum tuberosum L. · Potato
Stet Holland BV (NL)
Sinapis alba L. · White mustard
ILVO-PLANT 39
Lagenaria siceraria (Molina) Standl. · Calabash
Paul Degreef