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
Jacob Eising
Solanum tuberosum L. · Potato
Tjerk Krijthe
Solanum tuberosum L. · Potato
Germicopa SAS, FR
Solanum tuberosum L. · Potato
MARIEN WINTERS
Solanum tuberosum L. · Potato
SAKA PFLANZENZUCHT GMBH AND CO KG
Solanum tuberosum L. · Potato
R. L. J. MANSHOLT
Solanum tuberosum L. · Potato
GUUS HESELMANS
Solanum tuberosum L. · Potato
Teagasc Crops Research Centre
Solanum tuberosum L. · Potato
Mr. J.J.H.M. Allefs
Solanum tuberosum L. · Potato
IPR B.V.
Solanum tuberosum L. · Potato
MR.E.A.BOERHAVE
Solanum tuberosum L. · Potato
KONST RESEARCH BV (NL)
Solanum tuberosum L. · Potato
Wolf Lange (DE)
Solanum tuberosum L. · Potato
Meijer C. BV (NL)
Raphanus sativus L. var. oleiformis Pers. · Oil radish
PHP PETERSEN
Solanum tuberosum L. · Potato
P.I.J. VAN DER WERFF & COOP. DE Z.P.C.
Solanum tuberosum L. · Potato
SAKA-RAGIS PFLANZENZUCHT GBR
Solanum tuberosum L. · Potato
F.BRANDS
Solanum tuberosum L. · Potato
M. WINTENS_
Solanum tuberosum L. · Potato
Jack Dunnett
Solanum tuberosum L. · Potato
Wolfgang Walter
Solanum tuberosum L. · Potato
Heinrich Böhm
Solanum tuberosum L. · Potato
U. OLDENBURGER (NL)
Solanum tuberosum L. · Potato
Saka Pflanzenzucht, D