How to Manage Pests

Pests in Gardens and Landscapes

Physiological shothole

Physiological shothole is an environmental disorder and does not warrant any chemical control. It is thought to be caused by stress. Physiological shothole causes reddish or purplish brown spots about 0.10 inch in diameter on leaves. The spots expand and their centers turn brown. Tiny, dark specks form in the brown centers, especially on buds. Spots on young leaves have a narrow, light green or yellow margin and their centers often fall out as leaves expand, leaving "shot holes."


Remove and destroy infected plant parts as soon as symptoms appear. Keep plants healthy by providing proper cultural care.

Physiological shothole on plum
Physiological shothole on plum


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