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. var. lycopersicum · Tomato
S.A.I.S. Societa Agricola Italiana Sementi
Solanum lycopersicum L. var. lycopersicum · Tomato
MERIDIEM SEEDS S.L.
Solanum lycopersicum L. · Tomato
Moshe Zalsman
Solanum lycopersicum L. · Tomato
Bayer Holland B.V.
Solanum lycopersicum L. · Tomato
RAMIRO ARNEDO, S.A.
Solanum lycopersicum L. · Tomato
Axia NL B.V.
Vitis L. · Grapevine
INCONNU (FR)
Solanum lycopersicum L. · Tomato
Shevchenko Igor
hybrids between Solanum lycopersicum L. and S. habrochaites S. Knapp & D.M. Spooner
MERIDIEM SEEDS S.L.
Solanum lycopersicum L. var. lycopersicum · Tomato
ISI SEMENTI SPA
Capsicum annuum L. · Bell pepper
RAMIRO ARNEDO, S.A.
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Solanum lycopersicum L. · Tomato
DIAMOND SEEDS S.L.
Sorghum x drummondii (Steud.) Millsp. & Chase · Sudangrass
Advanta Seeds International (MU)
Beta vulgaris Sugar Beet Group · Sugar beet
DLF Beet Seed ApS, DK
Vitis L. · Grapevine
INCONNU (FR)
Vitis L. · Grapevine
INCONNU (FR)
Vitis L. · Grapevine
INCONNU (FR)
Solanum lycopersicum L. · Tomato
Syngenta Crop Protection AG
Cannabis sativa L. · Hemp
MARCEL DE WIT
Vitis L. · Grapevine
INCONNU (FR)
Solanum tuberosum L. · Potato
Ivanenko Mykola Mykolaiovych, Siharova Dina Dmytrivna, Mel`nyk Pavlo Oleksiiovych, Plotnyts`ka Ol`ha Volodymyrivna, Tymko Mykola Hryhorovych, Andriienko Tetiana Mykhailivna, Lysak Olena Andriivna, Pysarenko Nataliia Vasylivna, Sydorchuk Svitlana Volodymyr
Solanum tuberosum L. · Potato
Bondarchuk Anatolii Andriiovych, Osypchuk Andrii Antonovych, Taktaiev Borys Anatoliiovych, Nazar Stefaniia Hryhorivna, Sidakova Oksana Vladyslavivna, Kupriianova Tetiana Mykolaivna, Cherednychenko Liubov Mykolaivna, Zakharchuk Nataliia Anatoliivna, Borivs
Solanum tuberosum L. · Potato
BONDARCHUK ANATOLII ANDRIIOVYCH, MARUDA MARYNA YURIIVNA, ROZHNIATOVSKYI ANDRII OLEHOVYCH, FURDYHA MYKOLA MYKOLAIOVYCH, TOMASH ANATOLII IVANOVYCH, OSYPCHUK ALLA ANDRIIVNA, FEDORENKO OLEKSANDR LEONIDOVYCH, TAKTAIEV BORYS ANATOLIIOVYCH