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 B.V.
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE & CO.KGAA
hybrids between Solanum lycopersicum L. and S. habrochaites S. Knapp & D.M. Spooner
RIJK ZWAAN Zaadteelt en Zaadhandel B.V.
Solanum tuberosum L. · Potato
Veenkoloniale Boeren Bond (NL)
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE & CO.KGAA
Vitis L. · Grapevine
INCONNU (FR)
Solanum lycopersicum L. var. lycopersicum · Tomato
S.A.I.S. Societa Agricola Italiana Sementi
Solanum sisymbriifolium Lam. · Sticky nightshade
SCOTTISH CROP RESEARCH INSTITUTE
Prunus amygdalus x Prunus persica
AGROMILLORA IBERIA S.L.U
Tagetes patula L. · French marigold
Lammers Seed Options B.V.
Prunus L. · Plum
Ipomoea batatas (L.) Lam. · Sweet potato
Don R. LaBonte
Prunus persica (L.) Batsch · Peach
Daniele Bassi
Chrysanthemum L. · Chrysanthemum
Cleangro Ltd
Solanum lycopersicum L. · Tomato
De Ruiter Seeds B.V.
Prunus cerasifera Ehrh. x P. persica (L.) Batsch · Myrobalan x Peach
Nova S.r.l.
Prunus L. · Plum
Prunus armeniaca L. · Apricot
Daniele Bassi^^^Stefano Foschi
Prunus amygdalus x Prunus persica
KESTER DALE E.^^^ASAY RICHARD N.
Solanum tuberosum L. · Potato
HZPC Holland B.V.
Solanum tuberosum L. · Potato
Bavaria Saat GbR
Anemone L. · Anemone
Hardy's Cottage Garden Plants
Prunus amygdalus x Prunus persica
John K. Slaughter^^^Timothy J. Gerdts
Penstemon Schmidel. · Beard Tongue
Robert D. Jansen