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
STRUBE D and S GMBH
Raphanus sativus L. var. oleiformis Pers. · Oil radish
VANDINTER RESEARCH B.V.
Zea mays L. · Maize
SYNGENTA FRANCE S.A.S.
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Raphanus sativus L. var. oleiformis Pers. · Oil radish
VANDINTER RESEARCH B.V.
Hordeum vulgare L. · Barley
Löhde Jörgen
Raphanus sativus L. var. oleiformis Pers. · Oil radish
Instituut voor Landbouw- en Visserijonderzoek (ILVO) Eenheid Plant
hybrids between Solanum lycopersicum L. and S. habrochaites S. Knapp & D.M. Spooner
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Solanum tuberosum L. · Potato
ShANINA ELENA PETROVNA / KLYuKINA ELIZAVETA MATVEEVNA / KOKShAROV VLADIMIR PAVLOVICh
Solanum lycopersicum L. · Tomato
Kees Konst
Solanum lycopersicum L. · Tomato
Monsanto Invest, NL
Raphanus sativus L. var. oleiformis Pers. · Oil radish
VANDINTER RESEARCH B.V.
Solanum tuberosum L. · Potato
STET HOLLAND
Solanum lycopersicum L. · Tomato
Monstanto, NL
Solanum tuberosum L. · Potato
Vesa Velhartice a.s.
Raphanus sativus L. var. oleiformis Pers. · Oil radish
PETERSEN| Asmus Soeren Petersen in Fa. P.H. Petersen Saatzucht Lundsgaard GmbH / SCHLATHoeLTER| Michaela Schlathoelter
Solanum lycopersicum L. · Tomato
Seminis Vegetable Seeds
Medicago sativa L. · Alfalfa
Szarvasi Medicago (HU)
Solanum lycopersicum L. · Tomato
RIJK ZWAAN Zaadteelt en Zaadhandel B.V.
Solanum tuberosum L. · Potato
Zella J. Doig
Solanum tuberosum L. · Potato
Pomorsko Mazurska Hodowla Ziemniaka Sp.z o.o. z siedziba w Strzekecinie
Glycine max (L.) Merr. · Soybean
Stine Harry
Sinapis alba L. · White mustard
Lukas H. Wolters c/o Euro Grass BV