Infected leaves have many irregular purplish blotches. Centres of blotches become brownish, and blotches run together. Later, edges of the leaves dry up and look burned or scorched. Youngest leaves are initially immune to the disease. Disease may also develop on leaf stems and fruit calyx.
Spores travel in air currents and the disease is also spread by splashing rain.
Plants affected by leaf scorch do not overwinter well, and yields the following year may be reduced. Use resistant cultivars where practical. See Publication 360, Fruit Production Recommendations. Characteristic zones are v-shaped and include a leaf edge. The fungus overwinters in old leaves, and the disease is spread by splashing rain.