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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.

Solutions

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.

Shiny area on tip of fruit where waxy layer not formed, early russet scab; Glenn Co. Credit: Jack Kelly Clark, UC IPM
Lacy scab on plums. Credit: Jack Kelly Clark, UC IPM
Shiny area on side of fruit with a corky layer beginning to form; Glenn Co. Credit: Jack Kelly Clark, UC IPM
Russetted fruit Credit: Jack Kelly Clark, UC IPM
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