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 tuberosum L. · Potato
VŠÚZ - Výskumný a šlachtitelský ústav zemiakársky a.s.
Solanum tuberosum L. · Potato
Station de Recherche du Comité Nord G.I.E.
Beta vulgaris Sugar Beet Group · Sugar beet
SYNGENTA WINTER OILSEED AB
Solanum tuberosum L. · Potato
Niederösterreichische Saatbaugenossenschaft reg.Gen.m.b.H.
Medicago sativa L. · Alfalfa
Barenbrug Holland BV (NL)
Solanum tuberosum L. · Potato
ZUJKOV ANDREJ EVGEN'EVICh / NEZAKONOVA LYuDMILA VASIL'EVNA / DEDYuLYa VERA VLADIMIROVNA / YaShchENKO NINA PETROVNA / RYNDINA ELENA GRIGOR'EVNA / PIShchENKO LYuDMILA IVANOVNA / DOROZhOK ALLA NIKOLAEVNA / SEMENOVA ZOYa ALEKSANDROVNA
Sinapis alba L. · White mustard
Andreas Gertz
Avena strigosa Schreb. · Black oat
Gebr. Waal
Sinapis alba L. · White mustard
ILVO-PLANT 39
Solanum lycopersicum L. · Tomato
Syngenta Agro S.A.
Capsicum annuum L. · Bell pepper
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Solanum tuberosum L. · Potato
STET HOLLAND
Solanum lycopersicum L. · Tomato
Nirit Seeds Ltd (IL)
Oryza sativa L. · Rice
ENTE NAZIONALE RISI
Sinapis alba L. · White mustard
Michaela Schlathölter
Oryza sativa L. · Rice
SA.PI.SE SARDO PIEMONTESE SEMENTI
Solanum tuberosum L. · Potato
Sarvari Istvan
Solanum tuberosum L. · Potato
Sloots Aardappelkweekbedrijf B.V.
Solanum lycopersicum L. · Tomato
HM.Clause S.A.S.
Solanum tuberosum L. · Potato
Plantera Seed B.V.
hybrids between Solanum lycopersicum L. and S. habrochaites S. Knapp & D.M. Spooner
Enza Zaden Beheer B.V.
Solanum lycopersicum L. · Tomato
UNITED GENETICS SEEDS CO
Solanum lycopersicum L. · Tomato
Syngenta Seeds B.V.
Solanum lycopersicum L. · Tomato
Institut za povrtarstvo, S.Palanka