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The article focuses on alternaria leaf blight caused by Alternaria dauci on carrot in Turkey. The disease was extensive, with between 73 and 85% of fields inspected in the region being affected. Disease incidence of 65-90% was recorded in affected fields. The distribution of the disease in carrot fields was generally associated with high soil moisture levels, often corresponding to poor drainage. A fungus was consistently isolated from the margins of these lesions, onto potato carrot agar amended with streptomycin sulphate.