How to Manage Pests

Pests in Gardens and Landscapes

Alternaria blight—Alternaria spp.

Alternaria blight is a disease on carnation. It causes tan spots or blotches with purple margins to occur on leaves, flowers, or stems. Lesions may be around the stem base.


Use good sanitation. Remove infected plants and debris. Avoid overhead irrigation. Water in the morning so that plants dry quickly.

Alternaria leafspot lesions
Alternaria leafspot lesion

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

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