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
OSIPChUK ALLA ANDREEVNA / OSIPChUK ANDREJ ANTONOVICh / NAZAR STEFANIYa GRIGOR'EVNA / GRITSENKO EKATERINA PETROVNA / GAJDUK PETR PAVLOVICh / DMITROShchUK VALERIYa EVGEN'EVNA / KUChKO ANATOLIJ ANDREEVICh / MITSKO VLADIMIR NIKOLAEVICh / RAZKEVICh NIKOLAJ FIL
Solanum lycopersicum L. · Tomato
UNITED GENETICS SEEDS CO
Arachis hypogaea L. · Peanut
North Carolina Agricultural Research Service
Solanum lycopersicum L. · Tomato
HEINZSEED
Solanum lycopersicum L. · Tomato
HEINZSEED
Hybrids between Citrus x aurantium L. x Citrus trifoliata L.
VARIOS OBTENTORES
Hybrids between Citrus x aurantium L. x Citrus trifoliata L.
VARIOS OBTENTORES
Brassica juncea (L.) Czern. · Brown mustard
CREA- CENTRO DI RICERCA PER LE COLTURE INDUSTRIALI (CREA-CI-BO)
Solanum lycopersicum L. · Tomato
HAZERA GENETICS
Solanum lycopersicum L. · Tomato
UNITED GENETICS SEEDS CO
Solanum lycopersicum L. · Tomato
CLAUSE
Solanum lycopersicum L. · Tomato
HEINZSEED
Sorghum bicolor (L.) Moench subsp. bicolor · Sorghum
DEKALB PLANT GENETICS
Hybrids between Citrus x aurantium L. x Citrus trifoliata L.
IVIA
Solanum lycopersicum L. · Tomato
UNITED GENETICS SEEDS CO
Solanum lycopersicum L. · Tomato
Harmoniz
Solanum lycopersicum L. · Tomato
CAMPBELL SEEDS
Solanum lycopersicum L. · Tomato
CLAUSE
Gossypium hirsutum L. · Upland cotton
USDA MAINE
Solanum lycopersicum L. · Tomato
CLAUSE
Vitis berlandieri Planch. x Vitis riparia Michx.
INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE-INRA
Pistacia atlantica x Pistacia integerrima
Innea Alternativas Biotecnológicas S.L.
Ipomoea batatas (L.) Lam. · Sweet potato
Tara Smith^^^Christopher A. Clark^^^Arthur Q. Villordon^^^Don R. LaBonte
Citrus L. · Citrus
IVIA