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
agro- Tip Handels-u. Consultingges. mbH
Solanum lycopersicum L. · Tomato
HAZERA SEEDS BV
Solanum lycopersicum L. · Tomato
SEMILLAS FITO, S.A.
Solanum lycopersicum L. · Tomato
Gautier Semences SAS (FR)
Solanum lycopersicum L. · Tomato
Nunhems B.V.
Solanum tuberosum L. · Potato
Boerhave V.O.F.
Solanum tuberosum L. · Potato
NEIKER-INSTITUTO VASCO DE INVESTIGACIÓN Y DESARROLLO AGRARIO, S.A.
Solanum tuberosum L. · Potato
KARTZ VON KAMEKE
Solanum lycopersicum L. · Tomato
SAIS Spa
Solanum lycopersicum L. · Tomato
SEMILLAS FITO, S.A.
Solanum lycopersicum L. · Tomato
UNITED GENETICS SEEDS CO
Solanum tuberosum L. · Potato
Hodowla Ziemniaka Zamarte sp. z o.o. - Grupa IHAR
Allium cepa L. var. cepa · Onion
Bejo Zaden B.V., De Groot en Slot B.V.
Solanum lycopersicum L. var. lycopersicum · Tomato
MED HERMES S.R.L
Solanum tuberosum L. · Potato
Station de Recherche du Comite Nord (FR)/Groupement Interprofessionel de la Pomme de Terre (FR)
Solanum lycopersicum L. · Tomato
Syngenta Crop Protection AG
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Solanum tuberosum L. · Potato
Hodowla Ziemniaka Zamarte sp. z o.o. - Grupa IHAR
Capsicum annuum L. · Bell pepper
Enza Zaden Beheer B.V.
Solanum lycopersicum L. var. lycopersicum · Tomato
SYNGENTA SEEDS B.V , NL
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Solanum tuberosum L. · Potato
Hodowla Ziemniaka Zamarte sp. z o.o. - Grupa IHAR
Solanum lycopersicum L. · Tomato
Torsten Olsson Frö AB
Solanum tuberosum L. · Potato
Niederösterreichische Saatbaugenossenschaft reg.Gen.m.b.H.