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Willow Apple Gall Sawfly

Scientific Name: 
Pontania californica

The red gall is caused by the feeding of the larvae of a small sawfly.  The adult emerges from a small hole and flies away to find a mate so that more eggs may be laid on additional leaves.  Photo by Laurel Woodley

Garden Location: 
Lake, Stream Pond
Pontania californica gall on willow leaf
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