Scab infects leaves and fruit, causing dark spots to form. On almonds, twigs are also affected. Lesions
start as indistinct water-soaked spots that gradually turn brown in the center and have a lighter colored
margin. In the spring, these lesions develop a dark color. On leaves, yellowish green spots develop and
may later darken. Small greenish spots appear on fruit. When numerous lesions coalesce, cracking may occur
as the fruit enlarges. Scab lesions look greasy and oily.
Avoid overhead sprinklers or use a low angle to avoid wetting foliage. Pruning trees to allow good penetration
of sunlight and air movement can help in scab control. Treatment is not usually necessary in home orchards.
Fungicides used in spring for control of shot hole disease will also provide control of scab.