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
ZIMMERMANN (DE)/INCONNU (FR)
Solanum tuberosum L. · Potato
DANESPO A/S
Solanum lycopersicum L. · Tomato
FERRY MORSE
Beta vulgaris Sugar Beet Group · Sugar beet
STRUBE D&S GmbH, DE
Triticum aestivum L. · Bread wheat
SEMUNDO SAATZUCHT GMBH
Solanum lycopersicum L. · Tomato
Gautier Semences SAS (FR)
Raphanus sativus L. var. oleiformis Pers. · Oil radish
RAGT 2n, FR
Solanum lycopersicum L. · Tomato
Hristo Georgiev
Zea mays L. · Maize
PIONEER HI-BRED INT
Beta vulgaris Sugar Beet Group · Sugar beet
Inst. de Recherche MENNESSON (FR)
Solanum lycopersicum L. · Tomato
Solanum lycopersicum L. · Tomato
Nirit Seeds Ltd (IL)
Solanum tuberosum L. · Potato
UNION TEMPORAL EMPRESAS
Rosa L. · Rose
Dr. P.A. Van Der Pol (NL)
Solanum lycopersicum L. · Tomato
Clause Semences SA (FR)
Prunus persica (L.) Batsch · Peach
HANSEN CARL J.
Beta vulgaris Sugar Beet Group · Sugar beet
KWS Saat AG, DE
Solanum tuberosum L. · Potato
NORDKARTOFFEL ZUCHTGESE.
Beta vulgaris Sugar Beet Group · Sugar beet
DLF Beet Seed APS
Prunus persica (L.) Batsch · Peach
HANSEN CARL J.
Raphanus sativus L. var. oleiformis Pers. · Oil radish
RAGT 2n, FR
Dianthus caryophyllus L. · Carnation
West Stek B.V.
Solanum lycopersicum L. · Tomato
Angelo Boni
Solanum tuberosum L. · Potato
WOLF LANGE & FRITZ LANGE