Raspberry leaf spot

Raspberry leaf spot starts as small spots on the upper surface of young leaves. As the lesions grow, the infected tissue may fall out, leaving holes in the leaves. Badly infected leaves curl downward at the edges and drop prematurely.
The fungus that causes leaf spot overwinters in infected leaf debris and in cane lesions. Only young, expanding leaves are susceptible to infection. Spores are spread by splashing water, and leaf spot is common in years with frequent rain. The disease continues to spread all summer, as long as susceptible leaves are present. Leaf spot causes the most damage following summers with heavy rains in June and July.