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.
Glycine max (L.) Merr. · Soybean
Semences Prograin Inc
Hordeum vulgare L. · Barley
Saatzucht Josef Breun GmbH & Co.KG (DE)
Raphanus sativus L. var. oleiformis Pers. · Oil radish
VANDINTER RESEARCH B.V.
Solanum tuberosum L. · Potato
Sloots Solanum BV (NL)
Vitis L. · Grapevine
INCONNU (FR)
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Solanum tuberosum L. · Potato
Lantmõnnen Seed B.V.
Solanum lycopersicum L. · Tomato
Nirit Seeds Ltd (IL)
Solanum lycopersicum L. · Tomato
Hazera Seeds, ISR
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Solanum tuberosum L. · Potato
SCHROEDER JOACHIM| Joachim Schroeder
Raphanus sativus L. var. oleiformis Pers. · Oil radish
WIJK| Dr. A.J.P. van Wijk c/o Limagrain Advanta Nederland B.V.
Sinapis alba L. · White mustard
VANDINTER RESEARCH B.V.
Solanum lycopersicum L. · Tomato
SYNGENTA SEEDS B.V.
Solanum tuberosum L. · Potato
Piet H.Smeenge
Solanum tuberosum L. · Potato
SAKA-RAGIS PFLANZENZUCHT GBR
Solanum tuberosum L. · Potato
Cooeperatie Agrico U.A.
Avena strigosa Schreb. · Black oat
P.H. Petersen Saatzucht Lundsgaard GmbH Herrn Asmus Sören Petersen
Solanum lycopersicum L. · Tomato
SYNGENTA SEEDS B.V.
Beta vulgaris Sugar Beet Group · Sugar beet
Strube D&S GMBH
Raphanus sativus L. var. oleiformis Pers. · Oil radish
VANDINTER RESEARCH B.V.
Solanum lycopersicum L. · Tomato
Syngenta Crop Protection AG
Solanum lycopersicum L. · Tomato
ESASEM S.p.A
Solanum lycopersicum L. · Tomato
H.S.HEINZ COMPANY