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.
Daucus carota L. · Carrot
ROGER FREEMAN
Solanum lycopersicum L. · Tomato
OOO 'AGROFIRMA PARTNER'
Solanum lycopersicum L. · Tomato
Seminis Vegetable Seeds
Daucus carota L. · Carrot
BEJO ZADEN
Brassica napus var. napus · Rapeseed
JOHANNES DIECKMANN
Brassica napus var. napus · Rapeseed
KWS SAAT SE&CO.KGaA, DE
Brassica napus var. napus · Rapeseed
KWS SAAT SE&CO.KGaA, DE
Solanum tuberosum L. · Potato
NIEDEROESTERREICHISCHE SAATBAUGENOSSENSCHAFT
Daucus carota L. · Carrot
ROGER FREEMAN
Sinapis alba L. · White mustard
VANDINTER SEMO B.V.
Brassica napus var. napus · Rapeseed
KWS MOMONT RECHERCHE S.A.R.L
Helianthus annuus L. · Sunflower
RAGT 2N S.A.S
Solanum tuberosum L. · Potato
Station de Recherche du ComitÚ Nord
Daucus carota L. · Carrot
Vilmorin SA (FR)
Daucus carota L. · Carrot
Khans Kole
Raphanus sativus L. var. oleiformis Pers. · Oil radish
VANDINTER RESEARCH B.V.
Sinapis alba L. · White mustard
VANDINTER SEMO B.V.
Sinapis alba L. · White mustard
ILVO-PLANT 39
Solanum lycopersicum L. · Tomato
Monsanto, NL
Daucus carota L. · Carrot
MORAVOSEED
Daucus carota L. · Carrot
MORAVOSEED
Brassica rapa L. subsp. campestris (L.) A. R. Clapham · Field mustard
J. Joordens' Zaadhandel B.V.
Triticum aestivum L. · Bread wheat
Rozalia Kadar, Maria Moldovan, Vasile Moldovan,
Daucus carota L. · Carrot
HM.CLAUSE