Diseases
Alternaria
Alternaria blight is a complex of fungal diseases characterized by the appearance of dark spots with concentric zonation on plant organs. The disease leads to tissue necrosis, a reduction in photosynthetic activity, and significant yield losses.
Mentioned in descriptions 2 812 varieties reference book.
Alternaria blight manifests as dark, brown, or black spots that often have a characteristic concentric pattern resembling a target. On leaves, the spots eventually coalesce, causing necrosis, while on stems and fruits, depressed areas form, which, in conditions of high humidity, are accompanied by a velvety olive-colored sporulation coating.
Disease development is most intense at temperatures from +20 to +30°C and high air humidity, including the presence of free moisture. The risk of infection increases significantly with dense planting, mechanical tissue damage, and mineral nutrient deficiencies, as the pathogens often act as a secondary infection attacking weakened plants.
Varietal resistance to Alternaria blight is achieved through a combination of passive barriers, such as tissue structure features, and active responses, such as hypersensitivity, which blocks pathogen development. Resistance evaluation of varieties in breeding is conducted through field trials on natural infestation sites and provocation methods using artificial inoculation, which allows for the differentiation of varieties by the degree of infection.
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
HZPC Holland BV (NL)
Brassica napus L. · Rapeseed
LIMAGRAIN EUROPE
Solanum tuberosum L. · Potato
Saatbau Linz OÖ. Landes-Saatbaugen.reg.Gen.m.b.H.
Solanum lycopersicum L. · Tomato
HEINZSEED
Allium porrum L. · Leek
Hazera Seeds B.V.
Daucus carota L. · Carrot
PLANTICO HODOWLA I NASIENNICTWO OGRODNICZE ZIELONKI SP. Z O.O.
Brassica napus var. napus · Rapeseed
OSEVA vývoj a výzkum s.r.o. (CZ)/SELGEN, a.s. (CZ)/SEMPRA PRAHA a.s. (CZ)/Národní centrum zemědělského a potravinářského výzkumu, v. v. i. (CZ)/Agritec Plant Research s.r.o. (CZ)
Brassica napus var. napus · Rapeseed
Hodowla Roslin Strzelce Sp z.o.o. Grupa IHAR
Brassica napus L. · Rapeseed
MONSANTO TECHNOLOGY
Daucus carota L. · Carrot
PLANTICO HODOWLA I NASIENNICTWO OGRODNICZE ZIELONKI SP. Z O.O.
Helianthus annuus L. · Sunflower
Euralis Semences
Brassica napus var. napus · Rapeseed
Monsanto Technology LLC, US
Daucus carota L. · Carrot
TAKII EUROPE B V
Solanum lycopersicum L. · Tomato
UNITED GENETICS SEEDS CO
Brassica napus L. · Rapeseed
SERASEM
Brassica napus var. napus · Rapeseed
Hodowla Roslin Smolice Sp.z o.o Grupa IHAR
Daucus carota L. · Carrot
W WEIBULL
Solanum lycopersicum L. · Tomato
WESTERN SEED ESPAÑA, S.A.
Allium porrum L. · Leek
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Solanum tuberosum L. · Potato
RUP «NAUCHNO - PRAKTICHESKIJ CZENTR NACZIONALNOJ AKADEMII NAUK BELARUSI PO KARTOFELEVODSTVU I PLODOOVOSHHEVODSTVU»
Solanum tuberosum L. · Potato
Niederösterreichische Saatbaugenossenschaft reg.Gen.m.b.H.
Daucus carota L. · Carrot
Vilmorin-Mikado S.A.S.
Solanum lycopersicum L. · Tomato
SAKATA SEED AMERICA INC US
Chrysanthemum x morifolium Ramat. · Florist's daisy
PIETERS| Dirk Pieters