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.
Hordeum vulgare L. · Barley
THE ABED FOUNDATION
Solanum lycopersicum L. · Tomato
UNICOPA/CLAUSE
Beta vulgaris Sugar Beet Group · Sugar beet
Strube D&S GMBH
Solanum lycopersicum L. · Tomato
HM.Clause S.A.S.
hybrids between Solanum lycopersicum L. and S. habrochaites S. Knapp & D.M. Spooner
VILMORIN, S.A.
Solanum lycopersicum L. · Tomato
H.S.HEINZ COMPANY
Spinacia oleracea L. · Spinach
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Solanum lycopersicum L. var. lycopersicum · Tomato
Wim SNIJDERS, NL
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Solanum tuberosum L. · Potato
FEUNEKES| E.J. Feunekes
Solanum lycopersicum L. · Tomato
HEINZSEED
Solanum lycopersicum L. · Tomato
HEINZSEED
Solanum lycopersicum L. · Tomato
Shai Nashilevitz
Avena strigosa Schreb. · Black oat
VANDINTER RESEARCH B.V.
Solanum lycopersicum L. · Tomato
OOO NPF 'AGROSEMTOMS'
Solanum tuberosum L. · Potato
Europlant Innovation GmbH & Co. KG
Capsicum annuum L. · Bell pepper
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Solanum lycopersicum L. · Tomato
Jean-Christophe Lepeltier
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE & CO.KGAA
Solanum tuberosum L. · Potato
WERKMAN| Fritz Werkman c/o Stet & Slot
Solanum tuberosum L. · Potato
Bretagne-Plants S.C.I.C.A.
Beta vulgaris Sugar Beet Group · Sugar beet
Societe Europeenne de Semences NV/SA (BE)
Solanum tuberosum L. · Potato
Station de Recherche du Comité Nord G.I.E.
Solanum lycopersicum L. · Tomato
Zeraim Gedera Ltd (IL)