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Frog eye leaf spot (Botryosphaeria obtusa) affects leaves and is the same pathogen that causes black rot on fruit and branches. Leaf spots (called “frog eye”) appear a few weeks after petal fall. These purple-colored spots reach ¼ inch in diameter, and then spot centers turn tan and fall out. 

Frog eye leaf spot symptom (Strang, UKY)
Frog eye leaf spot phase of black rot.

(Photo: John Strang, University of Kentucky)

Management:

  • Sanitation (removal of diseased leaves, mum-mified fruit, and branch cankers)
  • Fungicide sprays

     

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