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
STEFANO CARLI
Beta vulgaris Sugar Beet Group · Sugar beet
Ulf Gyllenspetz c/o Syngenta Seeds AB / Tage Werner c/o Syngenta Seeds AB
Solanum lycopersicum L. · Tomato
Kees Konst
Solanum tuberosum L. · Potato
Fobek B.V., Broer A.J. Siderius, Potato Masters Picardie S.A.S., Tuberosum Technologies Inc.
Solanum lycopersicum L. · Tomato
UNITED GENETICS SEEDS CO
Solanum tuberosum L. · Potato
Kartoffelzucht Böhm GmbH & Co. KG
Solanum lycopersicum L. · Tomato
DE RUITER ZONE
Solanum tuberosum L. · Potato
Olsztyńska Hodowla Ziemniaka i Nasiennictwo OLZNAS-CN sp. z o.o.
Beta vulgaris Sugar Beet Group · Sugar beet
D J Van der Have BV (NL)
Beta vulgaris Sugar Beet Group · Sugar beet
DIECKMANN JOHANNES| Johannes Dieckmann
Beta vulgaris Sugar Beet Group · Sugar beet
SESVanderhave NV
Cucumis sativus L. · Cucumber
PETOSEED CO
Solanum tuberosum L. · Potato
HZPC Holland BV (NL)
Solanum tuberosum L. · Potato
Sjouke Brunia, Klazina Brunia-Winter, Marja van der Stelt-Brunia, Simon Brunia
Beta vulgaris Sugar Beet Group · Sugar beet
Syngenta Crop Protection AG, CH
Solanum lycopersicum L. · Tomato
Katarzyna Grabka
Solanum lycopersicum L. · Tomato
Syngenta Seeds B.V.
Solanum lycopersicum L. · Tomato
Nashilevitz Shai
Dianthus caryophyllus L. · Carnation
NOBBIO GIACOMO|Baratta Nicoletta
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)
Medicago sativa L. · Alfalfa
ABI Alfalfa Jim Moutray (US)
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)
Camelina sativa (L.) Crantz · Camelina
Uniwersytet Przyrodniczy w Poznaniu
Solanum lycopersicum L. · Tomato
Enza Zaden Bikhir B.V.