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Galls or egg masses? - Asteromyia carbonifera

Galls or egg masses? - Asteromyia carbonifera
Fletcher Wildlife Garden, Ottawa-Carleton, Ontario, Canada
August 14, 2013
I found these white "splotches" on a goldenrod leaf, and wonder if they are galls, or something else? They actually appear to be on top of the leaf rather than part of the leaf, so perhaps not galls. Egg masses?

Moved from ID Request.
I think it's pretty much certain that's what they are.

Did you get a shot of the underside?
They look like they could be Asteromyia carbonifera galls. If they really weren't embedded in the leaf, though, they would have to be something else.

Not really sure
that they were NOT part of the leaf, it was just the impression I got after viewing the photos. But looking at images of Asteromyia carbonifera galls here, they certainly do look like the ones I saw on the goldenrod leaf. I just wish I had taken more photos.

No, unfortunately
I didn't think to look at the underside and photograph it. I'll have to keep a look out for the same things this summer and pay more attention. Thanks for your comments.

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