How to Manage Pests

Pests in Gardens and Landscapes

Scab—Cladosporium carpophilum

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.

Life cycle

Solutions

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.

Scab lesions on peach
Scab lesions on peach
Scab lesions on almond
Scab lesions on almond

Early infection on almonds
Early infection on almonds

Scab lesions darken on almonds
Scab lesions darken on almonds

Statewide IPM Program, Agriculture and Natural Resources, University of California
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