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
Nunhems BV (NL)
Beta vulgaris Sugar Beet Group · Sugar beet
SAS FLORIMOND-DESPREZ Veuve et Fils
Solanum lycopersicum L. · Tomato
HM.Clause S.A.S.
Solanum tuberosum L. · Potato
APPACALE, S.A.
Solanum lycopersicum L. · Tomato
Multi Tohum San. Tic. A.S.
Phaseolus vulgaris L. · Common bean
Bean International Research and Development-Bird (FR)
Solanum tuberosum L. · Potato
Niederösterreichische Saatbaugenossenschaft reg.Gen.m.b.H.
Raphanus sativus L. var. oleiformis Pers. · Oil radish
PETERSEN| Asmus Soeren Petersen in Fa. P.H. Petersen Saatzucht Lundsgaard GmbH & Co KG
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE & CO.KGAA
Beta vulgaris Sugar Beet Group · Sugar beet
Syngenta Crop Protection AG, CH
Solanum lycopersicum L. · Tomato
Petoseed, US
Solanum lycopersicum L. · Tomato
Syngenta Seeds BV (NL)
Solanum lycopersicum L. · Tomato
Asgrow (IT)
Solanum tuberosum L. · Potato
MOELLER| Dr. Karl Heinz Moeller im Institut f.Kartoffelforschung- Abt. Kartoffelzuechtung - / PAPENHAGEN| Dr. Friedrich Papenhagen / TAENDLER| Dr. Karl Taendler
Solanum tuberosum L. · Potato
KWEEKINSTITUUT KARNA
Beta vulgaris Sugar Beet Group · Sugar beet
STRUBE GmbH&Co.KG, DE
Solanum lycopersicum L. · Tomato
Syngenta Seeds B.V. (NL)
Avena sativa L. · Oat
Lundin, Per/Hagberth, Nils Ola
Solanum tuberosum L. · Potato
ZPC
Allium sativum L. · Garlic
INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE & CO.KGAA
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE & CO.KGAA
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE & CO.KGAA
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE & CO.KGAA