and life cycle—Dothiorella canker
The fungus that caused Dothiorella canker can infect only through wounds. Heavy rainfall causes increased spore production and infection. Spores are produced in or on cankers, dead twigs, and dying fruit and leaves, and they spread in air and water. Infection on stems and leaves commonly develops during hot weather and where irrigation is not adequately managed. Trees that are stressed are more susceptible to infection.
Browning of leaf margins