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.
Solanum lycopersicum L. · Tomato
SEMINIS VEGETABLE SEED IB
Solanum lycopersicum L. · Tomato
Gautier Semences SAS (FR)
Solanum tuberosum L. · Potato
Niederösterreichische Saatbaugenossenschaft reg.Gen.m.b.H.
Solanum lycopersicum L. · Tomato
TAKII & CO LTD
Gossypium hirsutum L. · Upland cotton
DR.DELBERT HESS
Nicotiana tabacum L. · Tobacco
Dimitar S. Shabanov, Nikola G. Tomov, Vasil D. Pophristov, Boris K. Chinchev, Zorka Haleva, Dimitar H. Mazneykov
Solanum lycopersicum L. · Tomato
Syngenta Seeds B.V.
Solanum lycopersicum L. · Tomato
PETOSEED CO
Solanum lycopersicum L. · Tomato
Sais SPA, I
Solanum tuberosum L. · Potato
Aide Tsahkna 70%, Alice Anderfeld 20%, Mati Koppel 10%
Solanum lycopersicum L. · Tomato
TAKII EUROPE B V
Solanum tuberosum L. · Potato
SCHUCHMANN| Dr. Walter Schuchmann / BOEHM GEORG| Georg Boehm
Solanum sisymbriifolium Lam. · Sticky nightshade
Vandinter Research B.V.
Capsicum annuum L. · Bell pepper
FENIX S.R.L.
Solanum lycopersicum L. · Tomato
INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR
Capsicum annuum L. · Bell pepper
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Solanum lycopersicum L. · Tomato
SEMILLAS FITO, S.A.
Solanum lycopersicum L. · Tomato
Enza Zaden Beheer B.V.
Prunus persica (L.) Batsch · Peach
INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR
hybrids between Solanum lycopersicum L. and S. habrochaites S. Knapp & D.M. Spooner
Axia Vegetable Seeds B.V.
Solanum lycopersicum L. · Tomato
Syngenta Seeds B.V.
Solanum tuberosum L. · Potato
WALLMUELLER| Walter Wallmueller
Solanum lycopersicum L. · Tomato
SEMILLAS FITO, S.A.