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Willow Apple Gall Sawfly

Pontania californica


I was curious to see if they were fungal galls and cut one open and found a larva inside. The plant was covered in them.


Last two photos show the host plant. In a wooded area at the edge of Shollenberger Park

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1 Comment

Tukup 5 months ago

Hi Machi. This is really interesting. Recently I've been looking into galls, but not to the point of knowing what I'm talking about yet :-) I did find a similar gall in the following link. Open the link and go down to #7 - Initiation of Plant Galls. About the 4th photo down looks suspiciously like yours. Perhaps you can track it from this site. Good luck and thanks for sharing


Spotted by

California, USA

Lat: 38.22, Long: -122.60

Spotted on Nov 5, 2018
Submitted on Jan 26, 2019

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