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.
Brassica oleracea L. (Broccoli Group) · Broccoli
HM Clause SA (FR)
Daucus carota L. · Carrot
Vilmorin, F
Solanum tuberosum L. · Potato
SELECTIEBEDRIJF KOOI
Daucus carota L. · Carrot
Bejo Zaden B.V.
Daucus carota L. · Carrot
Bejo Zaden, NL
Daucus carota L. · Carrot
HM.CLAUSE
Solanum lycopersicum L. · Tomato
Monsanto, NL
Helianthus annuus L. · Sunflower
MAY AGRO SEED COPR.
Brassica napus var. napus · Rapeseed
LIDEA FRANCE SAS
Citrus L. · Citrus
VELDMAN, Frederik Johannes ESSELEN, Leon Leipold
Hybrids between Citrus reticulata Blanco and Citrus sinensis (L.) Osbeck · Orange
The State of Queensland acting through The Department of Agriculture and Fisheries
Citrus L. · Citrus
Frutas Beltran S.L.
Brassica napus L. · Rapeseed
Euralis Semences FR
Brassica napus var. napus · Rapeseed
KWS SAAT SE & CO.KGAA
Helianthus annuus L. · Sunflower
SC Quality Crops Genetics SRL
Helianthus annuus L. · Sunflower
Institut za ratarstvo i povrtarstvo, Novi Sad
Brassica napus L. · Rapeseed
Thomas Foubert
Brassica napus var. napus · Rapeseed
Norddeutsche Pflanzenzucht Hans-Georg Lembke KG
Brassica napus L. · Rapeseed
Raps GbR Saatzucht Lundsgaard
Solanum lycopersicum L. · Tomato
PETOSEED CO
Brassica napus L. · Rapeseed
SAATZUCHT DONAU GESMBH&COKG
Brassica napus L. · Rapeseed
Norddeutsche Pflanzenzucht Hans-Georg Lembke KG
Brassica napus var. napus · Rapeseed
Limagrain Europe S.A.S
Brassica napus var. napus · Rapeseed
BASF AGRICULTURAL SOLUTIONS US LLC