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
Institut für Kartoffelforschung Herrn Horst Beyer / Hans-Georg Zschüttig im Institut für Kartoffelforschung
Solanum lycopersicum L. · Tomato
De Ruiter Zonen (HR)
Solanum lycopersicum L. · Tomato
MAURIZIO BACCHI
Solanum tuberosum L. · Potato
Hodowla Ziemniaka Zamarte sp. z o.o. - Grupa IHAR
Solanum lycopersicum L. · Tomato
HAZERA GENETICS
Solanum lycopersicum L. · Tomato
TOMAS DAVID LOMAS CANO
Solanum tuberosum L. · Potato
University of Pannonia,Potato Research Centre (HU)
Solanum tuberosum L. · Potato
Hodowla Ziemniaka Zamarte sp. z o.o. - Grupa IHAR
Solanum tuberosum L. · Potato
SAKA| SaKa Pflanzenzucht GmbH & Co. KG
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel B.V. (NL)
Solanum lycopersicum L. · Tomato
Nunhems B.V.
Solanum lycopersicum L. · Tomato
Khenkuet Rene
Solanum tuberosum L. · Potato
Europlant Innovation GmbH & Co. KG
Solanum lycopersicum L. · Tomato
ZERAIM GEDERA
Solanum tuberosum L. · Potato
KWEEKINSTITUUT KARNA
Solanum tuberosum L. · Potato
University of Pannonia,Potato Research Centre (HU)
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE & CO.KGAA
Solanum tuberosum L. · Potato
Saatbau Linz OÖ. Landes-Saatbaugen.reg.Gen.m.b.H.
Capsicum annuum L. · Bell pepper
GRAINES GAUTIER, S.A.
Solanum lycopersicum L. · Tomato
HEINZSEED
Solanum lycopersicum L. · Tomato
Seminis Vegetable Seeds
Solanum tuberosum L. · Potato
Domaine Public (FR)
Avena sativa L. · Oat
Oregro Seeds
Capsicum annuum L. · Bell pepper
TAKII EUROPE B V