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.
Solanum lycopersicum L. · Tomato
Enza Zaden Beheer B.V.
Solanum lycopersicum L. · Tomato
HAZERA SEEDS BV
Solanum lycopersicum L. · Tomato
Enza Zaden Beheer B.V.
Phacelia tanacetifolia Benth. · Lacy phacelia
PRZEDSIęBIORSTWO NASIENNE "ROLNAS" SP. Z O.O.
Solanum tuberosum L. · Potato
Hodowla Ziemniaka Zamarte sp. z o.o. - Grupa IHAR
Solanum tuberosum L. · Potato
UNIPLANTA| Uniplanta - Saatzucht KG
Solanum lycopersicum L. var. lycopersicum · Tomato
NIRIT SEEDS
Solanum lycopersicum L. · Tomato
Gautier Semences SAS (FR)
Solanum lycopersicum L. · Tomato
Syngenta Crop Protection AG
Solanum lycopersicum L. · Tomato
Gautier Semences SAS (FR)
Solanum lycopersicum L. · Tomato
Enza Zaden Beheer B.V.
Solanum lycopersicum L. · Tomato
HM.Clause S.A.S.
Solanum lycopersicum L. · Tomato
HM.CLAUSE
Solanum lycopersicum L. · Tomato
Enza Zaden Beheer B.V.
Lagenaria siceraria (Molina) Standl. · Calabash
Hazera Seeds B.V.
Solanum tuberosum L. · Potato
SCHEIDT| OAR Martin Scheidt in Bayerische Landesanstalt fuer Bodenkultur und Pflanzenbau / MUNZERT| LD Dr. Munzert in Bayerische Landesanstalt fuer Bodenkultur und Pflanzenbau
Solanum tuberosum L. · Potato
Averis Seeds B.V.
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Solanum lycopersicum L. · Tomato
UNITED GENETICS SEEDS CO
Solanum tuberosum L. · Potato
Interseed Potatoes GmbH
Beta vulgaris Sugar Beet Group · Sugar beet
NOVARTIS SEEDS
Solanum lycopersicum L. · Tomato
SEMILLAS FITO, S.A.
Solanum tuberosum L. · Potato
DUBININ SERGEJ VLADIMIROVICh / SEREGINA NADEZhDA IVANOVNA / ShANINA ELENA PETROVNA