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
Niederösterreichische Saatbaugenossenschaft reg.Gen.m.b.H.
Festuca arundinacea Schreb. · Tall fescue
PROSEEDS MARKETING
Solanum tuberosum L. · Potato
DANESPO AS, DK - 7323 GIVE
Lolium perenne L. · Perennial ryegrass
Norddeutsche Pflanzenzucht Hans-Georg Lembke KG. Herrn Dr. Martin Frauen / Inge Gaue
Medicago sativa L. · Alfalfa
RAGT 2N S.A.S
Glycine max (L.) Merr. · Soybean
THE MINNESOTA AGRICULTURAL EXPERIMENT STATION
Solanum tuberosum L. · Potato
Saka Pflanzenzucht GmbH Co KG
Prunus persica (L.) Batsch · Peach
University of Florida
Raphanus sativus L. var. oleiformis Pers. · Oil radish
LAMMERS SEED OPTIONS
hybrids between Solanum lycopersicum L. and S. habrochaites S. Knapp & D.M. Spooner
Nunhems B.V.
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Solanum tuberosum L. · Potato
Aardappelkweek- en Selectiebedrijf Ijsselmeerpolders B.V.
Solanum lycopersicum L. · Tomato
ENZA ZADEN BEHEER B.V.
Solanum tuberosum L. · Potato
SCOTTISH RESEARCH INSTITUTE
hybrids between Solanum lycopersicum L. and S. habrochaites S. Knapp & D.M. Spooner
MARTIJN VAN STEE
Solanum lycopersicum L. · Tomato
Syngenta, NL
hybrids between Solanum lycopersicum L. and S. habrochaites S. Knapp & D.M. Spooner
Seminis Vegetable Seeds
Gossypium hirsutum L. · Upland cotton
MONSANTO TECHNOLOGY
Raphanus sativus L. var. oleiformis Pers. · Oil radish
PHP PETERSEN
Olea europaea L. · Olive
Raphanus sativus L. var. oleiformis Pers. · Oil radish
LAMMERS SEED OPTIONS
Trifolium pratense L. · Red clover
FAL Station de Recherche Agronomique Federale (CH)
Solanum tuberosum L. · Potato
SICA GROCEP
Solanum lycopersicum L. · Tomato
Nunhems B.V., 6083 AB Nunhem