How to Manage Pests

Pests in Gardens and Landscapes

Lacy scab (Russet scab)

Lacy scab, also known as russet scab, occurs on plums and prunes. The waxy coating on the fruit is cracked. Fruit may be superficially russetted mostly on the stylar end.


Lacy scab is a physiological disorder that develops in years of excessive rain during and soon after bloom. It does not usually cause major problems and can be tolerated. No treatment is required.

Lacy scab on plums
Lacy scab on plums

Russetted fruit
Russetted fruit

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