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 tuberosum L. · Potato
LANGE FRANK / LANGE WINFRID
Beta vulgaris Sugar Beet Group · Sugar beet
Betaseed GmbH (DE)
Solanum lycopersicum L. · Tomato
Seminis Vegetable Seeds
Phacelia tanacetifolia Benth. · Lacy phacelia
SAATZUCHT STEINACH GMBH and CO KG
Solanum tuberosum L. · Potato
Heinrich Böhm
Solanum lycopersicum L. · Tomato
Enza Zaden, NL
Raphanus sativus L. var. oleiformis Pers. · Oil radish
J. JOORDENS' ZAADHANDEL
Phacelia tanacetifolia Benth. · Lacy phacelia
Poznanska Hodowla Roslin Sp. z o.o
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)
Raphanus sativus L. var. oleiformis Pers. · Oil radish
J. Joordens' Zaadhandel B.V.
Raphanus sativus L. var. oleiformis Pers. · Oil radish
RAGT 2n
Sinapis alba L. · White mustard
J. JOORDENS' ZAADHANDEL
Solanum lycopersicum L. · Tomato
Sylvain Bontems
Solanum lycopersicum L. · Tomato
Kees Konst
Medicago sativa L. · Alfalfa
Dominique Noel
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)
Avena strigosa Schreb. · Black oat
Jouffray-Drillaud SA (FR)
Vicia villosa Roth · Hairy vetch
Jouffray-Drillaud SA (FR)
Solanum tuberosum L. · Potato
Teagasc
Solanum tuberosum L. · Potato
SCHUCHMANN| Dr. Walter Schuchmann / BOEHM GEORG| Georg Boehm
Raphanus sativus L. var. oleiformis Pers. · Oil radish
LAMMERS SEED OPTIONS
Solanum tuberosum L. · Potato
IPR B.V., Helena Geeske Hoogland-Krüse
Solanum lycopersicum L. · Tomato
Syngenta Seeds
Solanum tuberosum L. · Potato
Landbrugets Kartoffelfond, Foraedlst., DK-7184 Vandel