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.
Medicago sativa L. · Alfalfa
RAGT 2N S.A.S
Sinapis alba L. · White mustard
ILVO-PLANT 39
Solanum tuberosum L. · Potato
Teagasc
Solanum tuberosum L. · Potato
SAKA PFLANZENZUCHT GMBH AND CO KG
Raphanus sativus L. var. oleiformis Pers. · Oil radish
RAGT 2n
Solanum lycopersicum L. · Tomato
Hazera Genetics Ltd (IL)
Medicago sativa L. · Alfalfa
Pioneer Hi-Bred International (US)
Raphanus sativus L. var. oleiformis Pers. · Oil radish
Lammers Seed Options B.V.
Solanum lycopersicum L. · Tomato
Monsanto Vegetable, NL
Beta vulgaris Sugar Beet Group · Sugar beet
LION SEEDS
Solanum tuberosum L. · Potato
Lars Naested
Solanum lycopersicum L. · Tomato
Monsanto Vegetable, NL
Solanum tuberosum L. · Potato
Justus Bohm
Solanum tuberosum L. · Potato
Station du Comite Nord (FR)
Solanum lycopersicum L. · Tomato
ZETA SEEDS S.L.
Raphanus sativus L. var. oleiformis Pers. · Oil radish
J. Joordens' Zaadhandel B.V.
Solanum tuberosum L. · Potato
Pomorsko Mazurska Hodowla Ziemniaka Sp.z o.o. z siedziba w Strzekecinie
Solanum tuberosum L. · Potato
Boerhave V.O.F.
Solanum lycopersicum L. · Tomato
Steven Schroeder
Trifolium repens L. · White clover
DLF-Seeds A/S
Solanum tuberosum L. · Potato
Johanna Anny Pruim-van Loon^^^Hubrecht Jan van Loon^^^Anthonie Elbert van Loon^^^Elbertus Marius van Loon^^^Jan Pieter van Loon^^^Johanna Wilhelmina Maatje van Loon-Kloet
Solanum tuberosum L. · Potato
J.M. Kannegieter, H.Kannegieter,
Prunus persica (L.) Batsch · Peach
United State Department of Agriculture - Georgie (US)
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)