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
AGR.INST.OAKPARK
Solanum lycopersicum L. · Tomato
HM.CLAUSE
Avena strigosa Schreb. · Black oat
J. Joordens' Zaadhandel B.V.
Beta vulgaris Sugar Beet Group · Sugar beet
DLF Beet Seed APS
Sinapis alba L. · White mustard
ILVO-PLANT 39
Solanum lycopersicum L. · Tomato
Syngenta Crop Protection AG
Hordeum vulgare L. · Barley
Sejet Planteforaedling I,S
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE and CO KGAA
Solanum lycopersicum L. · Tomato
Monsanto, NL
Solanum tuberosum L. · Potato
UNIPLANTA| Uniplanta - Saatzucht KG
Raphanus sativus L. var. oleiformis Pers. · Oil radish
RAGT 2n, FR
Solanum lycopersicum L. · Tomato
Kees Konst
Raphanus sativus L. var. oleiformis Pers. · Oil radish
Paul Baecker / Michaela Schlathölter
Solanum lycopersicum L. · Tomato
Syngenta Seeds B.V.
Solanum tuberosum L. · Potato
Wolfgang Walter
Raphanus sativus L. var. oleiformis Pers. · Oil radish
VANDINTER RESEARCH B.V.
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Solanum lycopersicum L. · Tomato
Kees Konst
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE and CO KGAA
Cydonia Mill. · Quince
Solanum tuberosum L. · Potato
Bretagne-plants (FR)
Solanum tuberosum L. · Potato
Heinrich Böhm
Sinapis alba L. · White mustard
VANDINTER RESEARCH B.V.
Solanum tuberosum L. · Potato
Bretagne-Plants S.C.I.C.A.