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
Sakata Seed Sudamerica Ltd (BR)
Lactuca sativa L. · Lettuce
ANSEME SRL
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE & CO.KGAA
Solanum lycopersicum L. · Tomato
Nunhems B.V.
Dianthus caryophyllus L. · Carnation
LAB.PHI.VE.BARBERET&BLANC
Sorghum bicolor (L.) Moench · Sorghum
Pacific Seeds Pty Ltd
Solanum lycopersicum L. · Tomato
Western Seed Espana S.A.
Beta vulgaris Fodder Beet Group · Mangelwurzel
Florimond Desprez Veuve et Fils, FR
Brassica napus var. napus · Rapeseed
LAMMERS| Ing. Piet Lammers
Solanum lycopersicum L. · Tomato
RIJK ZWAAN Zaadteelt en Zaadhandel B.V.
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Sinapis alba L. · White mustard
J. Joordens' Zaadhandel B.V.
Solanum lycopersicum L. · Tomato
UNITED GENETICS SEEDS CO
Solanum tuberosum L. · Potato
ZPC
Solanum lycopersicum L. · Tomato
SYNGENTA SEEDS B.V.
Solanum lycopersicum L. · Tomato
Syngenta Seeds B.V.
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Beta vulgaris Sugar Beet Group · Sugar beet
DLF Beet Seed APS
Beta vulgaris Sugar Beet Group · Sugar beet
Florimond Desprez Veuve et Fils, FR
Phaseolus vulgaris L. · Common bean
VELDHUYZEN V.ZANTE
Solanum lycopersicum L. · Tomato
SYNGENTA SEEDS B.V.
Solanum lycopersicum L. · Tomato
Seminis Vegetable Seeds
Beta vulgaris Sugar Beet Group · Sugar beet
Syngenta Seeds