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 lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Hordeum vulgare L. · Barley
ROTHWELL PLANT BREEDERS (GB)
Lilium L. · Lily
Ing. P. C. Schenk
Solanum lycopersicum L. · Tomato
HEBREW UNI/HAZERA
Solanum lycopersicum L. · Tomato
Nunhems B.V.
Solanum lycopersicum L. · Tomato
Syngenta Seeds B.V.
Solanum tuberosum L. · Potato
SCOTTISH CROP RESEARCH INSTITUTE
Solanum lycopersicum L. · Tomato
Sakata Seed Corporation (SCC)
Cucurbita maxima Duchesne · Giant pumpkin
SYNGENTA SEEDS B.V , NL
Solanum tuberosum L. · Potato
SCOTTISH CROP RESEARCH INSTITUTE
Solanum tuberosum L. · Potato
ROBERT JOHN CHERRY
Lavatera L. · Tree mallow
Kenneth Rigney
Solanum tuberosum L. · Potato
Agri-food and Biosciences Institute (AFBI Belfast)
Prunus L. · Plum
AGROMILLORA IBERIA S.L.U
hybrids between Prunus davidiana, Prunus dulcis and Prunus persica
JOAN TORRENTS DURAN , Agromillora Catalana SA
Prunus amygdalus x Prunus persica
Rubio-Cabetas Maria Jose,Mansergas Antonio Felipe
Solanum tuberosum L. · Potato
Zella J. Doig
Ipomoea batatas (L.) Lam. · Sweet potato
Tara Smith^^^Don R. LaBonte^^^Christopher A. Clark^^^Arthur Q. Villordon
Solanum tuberosum L. · Potato
The James Hutton Institute
Prunus L. · Plum
Solanum tuberosum L. · Potato
SCOTTISH CROP RESEARCH INSTITUTE
Avena sativa L. · Oat
Graminor AS, N-2322 Ridabu
Solanum tuberosum L. · Potato
New Zealand Institute for Crop and Food Research Ltd
Solanum tuberosum L. · Potato
SCRI INVERGOWRIE