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 tuberosum L. · Potato
Jan Lucas Spijkman, Johanna Maria Spijkman-Vergeer
Solanum tuberosum L. · Potato
Lietuvos agrarinių ir miškų mokslų centro Vokės filialas
Solanum lycopersicum L. · Tomato
MERIDIEM SEEDS S.L.
Solanum lycopersicum L. · Tomato
Syngenta Seeds B.V.
Solanum lycopersicum L. · Tomato
Enza Zaden Beheer B.V.
Solanum tuberosum L. · Potato
SCOTTISH RESEARCH INSTITUTE
Solanum lycopersicum L. var. lycopersicum · Tomato
S.A.I.S. Societa Agricola Italiana Sementi
Solanum lycopersicum L. · Tomato
Enza Zaden Beheer B.V.
Solanum lycopersicum L. var. lycopersicum · Tomato
ISI SEMENTI SPA
Capsicum annuum L. · Bell pepper
RAMIRO ARNEDO, S.A.
Solanum lycopersicum L. · Tomato
MERIDIEM SEEDS S.L.
Solanum lycopersicum L. · Tomato
Yuksel Tohumculuk Tarim San. ve Tic. Ltd. Sti.
Solanum lycopersicum L. · Tomato
Syngenta Seeds B.V.
Solanum lycopersicum L. · Tomato
Axia Vegetable Seeds B.V.
Beta vulgaris Sugar Beet Group · Sugar beet
SESVANDERHAVE N.V./S.A.
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)
Capsicum annuum L. · Bell pepper
Syngenta Crop Protection AG
Capsicum annuum L. · Bell pepper
Syngenta Crop Protection AG
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Solanum lycopersicum L. var. lycopersicum · Tomato
NIRIT SEEDS
Solanum lycopersicum L. · Tomato
Syngenta Crop Protection AG
Solanum lycopersicum L. · Tomato
ERMA ZADEN EXPORT B.V.
Solanum lycopersicum L. · Tomato
TOMATECH R&D ISRAEL L.T.D.