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
Saatzucht Hergen Berding
Solanum tuberosum L. · Potato
PLANT BREEDING INTERNATIONAL CAMBRIDGE
Solanum tuberosum L. · Potato
Kweek- en Researchbedrijf Agrico BV
Solanum tuberosum L. · Potato
GUUS HESELMANS
Solanum tuberosum L. · Potato
HANS JURGEN EVERS (T)
Hordeum vulgare L. · Barley
SAATZUCHT JOSEF BREUN GMBH and CO.KG
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE & CO.KGAA
Medicago sativa L. · Alfalfa
Vincent Beguier
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE & CO.KGAA
Solanum tuberosum L. · Potato
Prummel B.V.
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE & CO.KGAA
Solanum tuberosum L. · Potato
Nordkartoffel Zuchtgesellschaft mbH
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE and CO KGAA
Beta vulgaris Sugar Beet Group · Sugar beet
KWS| KWS SAAT AG
Solanum tuberosum L. · Potato
Kartoffelzucht Böhm GmbH & Co. KG (DE)
Solanum lycopersicum L. · Tomato
De Ruiter Seeds, NL
Solanum lycopersicum L. · Tomato
SAS HM Clause (FR)
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE and CO KGAA
Solanum tuberosum L. · Potato
LENNART ERJEFÄLT^^^BÖÖS ULLA
Solanum tuberosum L. · Potato
VEB SAAT
Solanum tuberosum L. · Potato
WOLF & WOLF B.V.
Sinapis alba L. · White mustard
J. JOORDENS' ZAADHANDEL
Medicago sativa L. · Alfalfa
Svalof Weibull AB
Medicago sativa L. · Alfalfa
S. A. FLORIMOND DESPREZ VEUVE ET FILS