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. Little is known about this disease, and losses caused by Phomopsis leaf blight have not been measured. Leaves less than10 days old are most susceptible. Spores are produced on living and dead leaves, and are spread by splashing rain. Spores germinate and enter the leaf through stomata on the lower leaf surface.