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Photo by K. Peter.
Alternaria rot is characterized by circular, dry, firm, shallow lesions covered with dark, olive green to black surface mycleial growth. The infected tissue is brown, like that caused by brown rot. The disease typically develops near insect feeding injuries, when fruit is overripe, in split pits of fruit, around skin breaks, or at the calyx or stem insertion.
Preventing skin injury is key to managing this disease. The strobilurin class of fungicides (FRAC Group Code 11) are most effective for managing Alternaria rot on both pome and stone fruit. Captan and EBDCs are ineffective.
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