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Home » Guide » Arthropods (Arthropoda) » Unidentified Tracks, Sign, and Other Mysteries » Unidentified Galls » Gall-like Structures Not Covered By BugGuide
Photo#1375233
on Ruellia nudiflora
Copyright © 2017 John Schneider

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]
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Contributed by John Schneider on 28 May, 2017 - 2:04am
Last updated 6 November, 2019 - 11:06am

Moved
Moved from Gall Midges and Wood Midges.

Per Ray's email.
… Charley Eiseman, 19 June, 2017 - 5:39pm login or register to post comments

Moved
Moved from Unidentified Signs on Algae, Fungi, and Plants.
… Charley Eiseman, 29 May, 2017 - 10:13pm login or register to post comments

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.
… Charley Eiseman, 28 May, 2017 - 8:53am login or register to post comments

 
Larva
I just posted one of the larvae
… John Schneider, 29 May, 2017 - 9:51pm login or register to post comments

 
Thanks, Charley
I've now emailed Dr. Gagne and plan to try to rear some out.
… John Schneider, 29 May, 2017 - 12:28am login or register to post comments

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