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
STRUBE GmbH&Co.KG, DE
Raphanus sativus L. var. oleiformis Pers. · Oil radish
Euro Grass B.V.
Raphanus sativus L. var. oleiformis Pers. · Oil radish
KWS SAAT SE and CO KGAA
Solanum tuberosum L. · Potato
Winfried Lange, Frank Lange
Avena sativa L. · Oat
Lantmaennen ek foer
Solanum tuberosum L. · Potato
NORIKA Nordring- Kartoffelzucht- und Ver
Raphanus sativus L. var. oleiformis Pers. · Oil radish
PHP PETERSEN
Solanum tuberosum L. · Potato
UNICOPA/CLAUSE
Raphanus sativus L. var. oleiformis Pers. · Oil radish
J. Joordens' Zaadhandel B.V.
Solanum lycopersicum L. · Tomato
HAZERA GENET./YISSUM RESE
Medicago sativa L. · Alfalfa
DLF Seeds A-S, DK
Solanum tuberosum L. · Potato
Wolfgang Walter
Sinapis alba L. · White mustard
Michiel E. de Vries c/o Joordens' Zaadhandel B.V.
Hordeum vulgare L. · Barley
Syngenta UK Ltd
Solanum tuberosum L. · Potato
Saka-Ragis (DE)
Solanum tuberosum L. · Potato
Heinrich Böhm
Sinapis alba L. · White mustard
PETERSEN| Asmus Soeren Petersen in Fa. P.H. Petersen Saatzucht Lundsgaard / BAECKER| Paul Baecker / HORN| Dr. Werner Horn
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE and CO KGAA
Solanum tuberosum L. · Potato
Heinrich Böhm
Medicago sativa L. · Alfalfa
SAATZUCHT STEINACH GmbH & Co KG (DE)
Raphanus sativus L. var. oleiformis Pers. · Oil radish
J. JOORDENS' ZAADHANDEL
Raphanus sativus L. var. oleiformis Pers. · Oil radish
J. Joordens' Zaadhandel B.V.
Raphanus sativus L. var. oleiformis Pers. · Oil radish
PHP PETERSEN
Solanum tuberosum L. · Potato
Kweekbedrijf-Zpc (NL)