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
Florimond Desprez Veuve et Fils, FR
Solanum lycopersicum L. · Tomato
HAZERA GENETICS
Beta vulgaris Sugar Beet Group · Sugar beet
Florimond Desprez Veuve et Fils, FR
Solanum lycopersicum L. · Tomato
INTERSEMILLAS SAU
Solanum lycopersicum L. · Tomato
Seminis Vegetable Seeds
Solanum tuberosum L. · Potato
Pomorsko Mazurska Hodowla Ziemniaka Sp.z o.o. z siedziba w Strzekecinie
Solanum lycopersicum L. · Tomato
PETOSEED CO
Solanum lycopersicum L. · Tomato
SEMILLAS FITO, S.A.
Solanum lycopersicum L. · Tomato
NIRIT SEEDS
Solanum tuberosum L. · Potato
Europlant Innovation GmbH & Co. KG
Solanum tuberosum L. · Potato
BRETAGNE PLANTS INNOVATION S.A.S.
Solanum tuberosum L. · Potato
Heinrich Böhm
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Solanum lycopersicum L. · Tomato
Syngenta Seeds B.V.
hybrids between Solanum lycopersicum L. and S. habrochaites S. Knapp & D.M. Spooner
Enza Zaden Beheer B.V.
Solanum tuberosum L. · Potato
Landbouwbedrijf Ebels B.V.
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Solanum tuberosum L. · Potato
SIPRE (FR)
Solanum lycopersicum L. · Tomato
FENIX S.R.L.
hybrids between Solanum lycopersicum L. and S. habrochaites S. Knapp & D.M. Spooner
Bayer Holland B.V.
Solanum lycopersicum L. · Tomato
Enza Zaden Beheer B.V.
Solanum lycopersicum L. · Tomato
Harris Moran Seed Company (USA) (US)
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)
Solanum lycopersicum L. · Tomato
UNITED GENETICS SEEDS CO