Willow Apple Gall Sawfly

Scientific Name: 
Pontania californica
Location

Garden Location: 
Lake, Stream Pond

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

Pontania californica gall on willow leaf
Viewing Months: 
Sep
Oct