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.
Beta vulgaris Sugar Beet Group · Sugar beet
SESVANDERHAVE, N.V./S.A.
Solanum lycopersicum L. · Tomato
ASGROW SEED CO
Solanum lycopersicum L. · Tomato
Clause Semences SA (FR)
Solanum lycopersicum L. · Tomato
Sakata Seed Corporation (SCC)
Beta vulgaris Sugar Beet Group · Sugar beet
SESVANDERHAVE NV-SA, BE
Solanum tuberosum L. · Potato
Pomorsko Mazurska Hodowla Ziemniaka Sp.z o.o. z siedziba w Strzekecinie
Hybrids between Citrus x aurantium L. x Citrus trifoliata L.
Solanum lycopersicum L. · Tomato
Axia NL B.V.
Capsicum annuum L. · Bell pepper
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Allium cepa L. · Onion
Burak Ozkale
Solanum lycopersicum L. · Tomato
Nunhems B.V.
Solanum tuberosum L. · Potato
Niederösterreichische Saatbaugenossenschaft reg.Gen.m.b.H.
Beta vulgaris Sugar Beet Group · Sugar beet
DLF Beet Seed APS
Solanum lycopersicum L. · Tomato
HM.Clause S.A.S.
Solanum lycopersicum L. · Tomato
Enza Zaden Beheer B.V.
Solanum lycopersicum L. · Tomato
Syngenta Seeds B.V.
Solanum lycopersicum L. · Tomato
Yuksel Tohumculuk Tarim San. ve Tic. Ltd. Sti.
hybrids between Solanum lycopersicum L. and S. habrochaites S. Knapp & D.M. Spooner
INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR
Solanum lycopersicum L. · Tomato
Nunhems B.V.
Capsicum annuum L. · Bell pepper
Enza Zaden Beheer B.V.
Beta vulgaris Sugar Beet Group · Sugar beet
Strube D&S GMBH
Solanum lycopersicum L. · Tomato
Domaine Public (FR)
Solanum lycopersicum L. · Tomato
HM.CLAUSE
Solanum lycopersicum L. · Tomato
INTERSEMILLAS SAU