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.
Festuca pratensis Huds. · Meadow fescue
Saatzucht Steinach GmbH & Co KG
Medicago sativa L. · Alfalfa
Barenbrug Holland BV (NL)
Solanum lycopersicum L. · Tomato
Paul Degreef
Solanum tuberosum L. · Potato
BOERHAVE VOF
Solanum tuberosum L. · Potato
SAATZUCHT FIRLBECK GMBH&CO.KG
Sinapis alba L. · White mustard
SCHLATHoeLTER| Michaela Schlathoelter
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)
Solanum tuberosum L. · Potato
Vesa Velhartice a.s.
Solanum lycopersicum L. · Tomato
Kees Konst
Sinapis alba L. · White mustard
J. Joordens' Zaadhandel B.V.
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Solanum lycopersicum L. · Tomato
Bejo Zaden, NL
Sinapis alba L. · White mustard
Michiel E. de Vries c/o Joordens' Zaadhandel B.V.
Raphanus sativus L. var. oleiformis Pers. · Oil radish
VANDINTER RESEARCH B.V.
Sinapis alba L. · White mustard
P.H. Petersen Saatzucht Lundsgaard GmbH (DE)
Raphanus sativus L. var. oleiformis Pers. · Oil radish
Lammers
Sinapis alba L. · White mustard
KWS SAAT SE and CO KGAA
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel B.V. (NL)
Solanum tuberosum L. · Potato
Europlant Innovation GmbH & Co. KG
Brassica juncea (L.) Czern. · Brown mustard
PHP PETERSEN
Solanum lycopersicum L. · Tomato
SAS HM Clause (FR)
Solanum tuberosum L. · Potato
Sloots Aardappelkweekbedrijf B.V.
Solanum lycopersicum L. · Tomato
ESASEM, I
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel B.V.