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 NV
Beta vulgaris Sugar Beet Group · Sugar beet
Henning Friehe
Beta vulgaris Sugar Beet Group · Sugar beet
Betaseed
Beta vulgaris Sugar Beet Group · Sugar beet
Betaseed
Brassica rapa L. subsp. pekinensis (Lour.) Hanelt · Napa cabbage
Takii & Company Ltd
Daucus carota L. · Carrot
NORTHRUP KING (US)
Solanum lycopersicum L. · Tomato
HM.Clause S.A.S.
Solanum lycopersicum L. · Tomato
Petr Klapste
Solanum tuberosum L. · Potato
Niederösterreichische Saatbaugenossenschaft reg.Gen.m.b.H.
Solanum lycopersicum L. · Tomato
Seminis Vegetable Seeds
Solanum tuberosum L. · Potato
P H SMEENGE
Solanum lycopersicum L. · Tomato
Rijk Zwaan B.V.
Solanum lycopersicum L. · Tomato
DE RUITER SEEDS
Lolium multiflorum Lam. ssp. italicum (A. Br.) Volkart · Italian ryegrass
BARENBRUG HOLLAND
Beta vulgaris Sugar Beet Group · Sugar beet
SESVanderhave NV
Brassica napus var. napus · Rapeseed
Serasem (FR)/Institut National de la Recherche Agronomique (FR)
Beta vulgaris Sugar Beet Group · Sugar beet
SESVanderHave N.V./S.A.
Solanum lycopersicum L. · Tomato
SEMILLAS FITO, S.A.
Solanum tuberosum L. · Potato
Pomorsko Mazurska Hodowla Ziemniaka Sp.z o.o. z siedziba w Strzekecinie
Solanum lycopersicum L. · Tomato
ESASEM S.p.A. (IT)
Solanum lycopersicum L. · Tomato
De Ruiter Zonen (HR)
Solanum tuberosum L. · Potato
Potato Breeding & Consultancy (PBC)
Solanum lycopersicum L. · Tomato
FRITS HERLAAR
Beta vulgaris Sugar Beet Group · Sugar beet
Betaseed GmbH (DE)