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 tuberosum L. · Potato
LKF-Vandel
Solanum tuberosum L. · Potato
Mr. J.P.M. Muijsers
Solanum tuberosum L. · Potato
R.P.GRAVELAND
Solanum tuberosum L. · Potato
Solana, D
Solanum tuberosum L. · Potato
Sjefke Allefs
Solanum tuberosum L. · Potato
Mr. G. Kuper
Solanum tuberosum L. · Potato
SCHUCHMANN| Dr. Walter Schuchmann / BOEHM GEORG| Georg Boehm
Hordeum vulgare L. · Barley
Saatzucht Josef Breun GdbR (DE)
Hordeum vulgare L. · Barley
Limagrain Nederland B.V.
Solanum tuberosum L. · Potato
LANDBRUGETS| Landbrugets Kartoffelfond, LKF
Solanum tuberosum L. · Potato
VAN DER VIIN SAAP
Solanum tuberosum L. · Potato
Wageningen UR Plant Breeding
Beta vulgaris Sugar Beet Group · Sugar beet
Van der Have B.V.
Solanum tuberosum L. · Potato
Wolfgang Walter
Raphanus sativus L. var. oleiformis Pers. · Oil radish
Schneider G. Saatzucht GmbH
Solanum tuberosum L. · Potato
R.J. Mansholt
Solanum tuberosum L. · Potato
Niederösterreichische Saatbaugenossenschaft reg.Gen.m.b.H.
Solanum tuberosum L. · Potato
GW te Winkel
Solanum tuberosum L. · Potato
WOLFGANG Walter, DE
Solanum tuberosum L. · Potato
HETTEMA ZONEN B.V
Solanum tuberosum L. · Potato
J.P.M.Muijsers
Solanum tuberosum L. · Potato
SOLANA GMBH & CO KG
Solanum tuberosum L. · Potato
Jacob Eising
Solanum tuberosum L. · Potato
GERMICOPA SAS