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on Ruellia nudiflora

on Ruellia nudiflora
Houston, Harris County, Texas, USA
May 23, 2017
The largest of the circles is about 4 mm in diameter.

Each circle consists of several small blisters full of tiny brown granules or spores. On some leaves, the blisters are arranged more randomly and not in circles. The blisters open, and after a while, little orange-white larvae appear, but they soon drop off and, in a few days, die. I thought I had some pictures of the larvae, but I can't find them at the moment. [Edit: larva posted]

Moved from Gall Midges and Wood Midges.

Per Ray's email.


Sounds like Cecidomyiidae...
but none are recorded from Ruellia. If you have saved any of the larvae, I'm sure Ray Gagne would be interested in seeing them. To rear them out, you would need to give them soil to burrow into, as described here.

I just posted one of the larvae

Thanks, Charley
I've now emailed Dr. Gagne and plan to try to rear some out.

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