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Circular galls - Pachypsylla celtidisasterisca

Circular galls - Pachypsylla celtidisasterisca
Prospect Park, Kings County, New York, USA
October 14, 2007
Size: ~3mm
The leaves of this tree were all covered with these galls.

Moved from Hackberry Psyllids.

Moved from galls. After some more looking, I'm convinced this is one of the several types of hackberry "button galls" produced by psyllids.

This is a hackberry tree, and there are a number of psyllids and gall midges that make galls on hackberry leaves. I've found illustrations of similar galls made by both groups, but no perfect matches.

more info
I don't know what these galls are, but to help in identification of galls, the following information is helpful (and often required):

- plant host species
- whether or not the gall is easily detachable
- perhaps some closer-up photos if the above info isn't enough
- rearing gall inhabitants to adulthood will definitely tell you what you've got (though be aware that many galls have parasitoids and inquilines in them)

The U.S. is in need of some more books on gall identifications...

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