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 lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)
Solanum tuberosum L. · Potato
Wilhelm Weuthen GmbH & Co. KG^^^Schaap Holland B.V.
Medicago sativa L. · Alfalfa
NSW DEPARTMENT OF AGRICULTURE
Solanum tuberosum L. · Potato
Interseed Potatoes GmbH
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Solanum lycopersicum L. · Tomato
Syngenta Crop Protection AG
Prunus persica (L.) Batsch · Peach
Maillard Arsene / Maillard Laurence
Raphanus sativus L. var. oleiformis Pers. · Oil radish
PHP PETERSEN
Solanum tuberosum L. · Potato
Teagasc Crops Research Centre
Solanum tuberosum L. · Potato
University of Idaho, Office of Technology Transfer
Sinapis alba L. · White mustard
Lammers Seed Options B.V.
Raphanus sativus L. var. oleiformis Pers. · Oil radish
PHP PETERSEN
Solanum tuberosum L. · Potato
LKF-Vandel
Solanum tuberosum L. · Potato
Interseed Potatoes GmbH
Solanum tuberosum L. · Potato
Wolfgang Walter
Solanum tuberosum L. · Potato
SICA GROCEP
Solanum tuberosum L. · Potato
Teagasc Crops Research Centre
Solanum tuberosum L. · Potato
Jack Dunnett
Solanum tuberosum L. · Potato
SAKA PFLANZENZUCHT GMBH AND CO KG
Solanum tuberosum L. · Potato
Kweek- en Researchbedrijf Agrico B.V.
Solanum tuberosum L. · Potato
The Potato Company
Solanum tuberosum L. · Potato
SCOTTISH RESEARCH INSTITUTE
Solanum tuberosum L. · Potato
Teagasc Oak Park Research Centre
Solanum tuberosum L. · Potato
Kweek- en Researchbedrijf Agrico B.V.