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
Hazera Seeds, NL
Beta vulgaris Sugar Beet Group · Sugar beet
STRUBE RESEARCH GMBH and CO KG
Solanum tuberosum L. · Potato
VOGEL JOSEF| Dr. Josef Vogel
Solanum lycopersicum L. · Tomato
NOVARTIS SEEDS B.V.
Sinapis alba L. · White mustard
Norddeutsche Pflanzenzucht Hans-Georg Lembke KG. Herrn Dr. Martin Frauen / Dr. Heinrich Enderlein
Phacelia tanacetifolia Benth. · Lacy phacelia
Walter Schuster
Prunus amygdalus x Prunus persica
Joaquín Gómez Aparisi^^^Antonio J. Felipe Mansergas^^^Rafael Socias i Company
Solanum tuberosum L. · Potato
Aardappelkweek- en Selectiebedrijf Ijsselmeerpolders B.V.
Solanum lycopersicum L. · Tomato
Enza Zaden Beheer B.V.
Beta vulgaris Sugar Beet Group · Sugar beet
SESVANDERHAVE N.V./S.A.
Solanum lycopersicum L. · Tomato
Paul Degreef
Solanum tuberosum L. · Potato
Grocep S.I.C.A.
Solanum tuberosum L. · Potato
Niederösterreichische Saatbaugenossenschaft reg.Gen.m.b.H.
Solanum lycopersicum L. · Tomato
Kees Konst
Raphanus sativus L. var. oleiformis Pers. · Oil radish
VANDINTER SEMO B.V.
Solanum lycopersicum L. · Tomato
Paul Degreef
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)
Solanum tuberosum L. · Potato
SAKA PFLANZENZUCHT GMBH AND CO KG
Solanum tuberosum L. · Potato
Heinrich Böhm
Solanum lycopersicum L. · Tomato
Syngenta Seeds B.V.
Hordeum vulgare L. · Barley
SAATZUCHT JOSEF BREUN GmbH&Co.KG
Solanum lycopersicum L. · Tomato
SYNGENTA SEEDS B.V.
Solanum lycopersicum L. · Tomato
DE RUITER SEEDS
Solanum lycopersicum L. · Tomato
WESTERN SEED ESPAÑA, S.A.