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Photo#333460
Rhopalomyia anthophila, Solidago flower gall with 2 larvae - Rhopalomyia anthophila

Rhopalomyia anthophila, Solidago flower gall with 2 larvae - Rhopalomyia anthophila
Lake Hawthorn, Mahaska County, Iowa, USA
September 10, 2009
Size: 6+ mm gall

Images of this individual: tag all
Cecidomyiidae, Solidago flower galls - Rhopalomyia anthophila Rhopalomyia anthophila, Solidago flower gall with 2 larvae - Rhopalomyia anthophila Rhopalomyia anthophila, Solidago flower gall with 2 larvae - Rhopalomyia anthophila Rhopalomyia anthophila larvae + parasitoid - Rhopalomyia anthophila Rhopalomyia anthophila larvae + parasitoid - Rhopalomyia anthophila

Moved
Moved from ID Request.

Rhopalomyia
Dr. Netta Dorchin have been helping me identify some of the gall flies of goldenrod. Her article is here; pages 6 and 7 would be the most interesting to you. It is very likely to be Rhopalomyia, but perhaps it is other than R. anthophila. There are a few others listed: R. cruziana, R. guttata, and R. racemicola.
Anyway, this is a great find. I hope that you open a few more galls. If you find the pupae they should be easier to identify than the larvae, from what I have learned. Also if you try to raise them, keeping them in water and covering them with netting, you may find some interesting things. I have been doing that, although the tiny size makes it terribly difficult. Knowing the species of goldenrod is also very important as I am finding out.
You can read about other gall makers and parasites. I will be happy to add yours to this growing list when we know a little more about it. You may contact Dr. Dorchin, her address is on the article.

 
Thanks much Beatriz. I believ
Thanks much Beatriz. I believe it is the Canada goldenrod, Solidago canadensis, very weedy. Yes, I have the plant in water in a jar covered with fine (wedding dress) material. But, having said that, I try a lot of galls without much success. I keep trying.

If I get emergence I will post a photo.

Thanks for the article link.

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