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
Ytzen Pieter van der Werff^^^HZPC Holland B.V.
Solanum tuberosum L. · Potato
MARIEN WINTERS
Solanum tuberosum L. · Potato
SAKA RAGIS PFLANZENZUCHT (DE)
Solanum tuberosum L. · Potato
UNICOPA/CLAUSE
Hordeum vulgare L. · Barley
SW SEED GMBH| SW Seed GmbH
Capsicum annuum L. · Bell pepper
CLAUSE, S.A.
Solanum tuberosum L. · Potato
Hodowla Ziemniaka Zamarte sp. z o.o. - Grupa IHAR
Solanum tuberosum L. · Potato
Selectiebedrijf KOOI (NL)
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE and CO KGAA
Sinapis alba L. · White mustard
P.H.PETERSEN SAATZUCHT LUNDSGAARD
Raphanus sativus L. var. oleiformis Pers. · Oil radish
PETERSEN| P.H. Petersen Saatzucht Lundsgaard GmbH Herrn Asmus Soeren Petersen
Hordeum vulgare L. · Barley
Nordic Seed A/S
Solanum tuberosum L. · Potato
Soltau-Bergen eG
Sinapis alba L. · White mustard
ZWAAN AND DE WILJES
Solanum tuberosum L. · Potato
UNIPLANTA
Medicago sativa L. · Alfalfa
Wirén, Gunnar /Lundin, Per
Solanum tuberosum L. · Potato
VOGEL JOSEF
Solanum tuberosum L. · Potato
KEIJER J., COMMIES H.S.
Solanum tuberosum L. · Potato
YaShINA IZOL'DA MAKSIMOVNA / RUSAKOVA IRINA GENNAD'EVNA / KALYaGIN YuRIJ NIKOLAEVICh / KABUNIN ALEKSANDR ANATOL'EVICh / KONDAKOVA NATAL'Ya NIKOLAEVNA / ALEKSANDROVA LYuBOV' ALEKSANDROVNA
Solanum tuberosum L. · Potato
Thomson, Allan J.
Solanum lycopersicum L. · Tomato
Vilmorin, F
Solanum tuberosum L. · Potato
SOLANA DEUTSCHLAND GmbH
Raphanus sativus L. var. oleiformis Pers. · Oil radish
PHP PETERSEN
Raphanus sativus L. var. oleiformis Pers. · Oil radish
PHP PETERSEN