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Photo#1575247
Tephritidae, white snakeroot - Eutreta

Tephritidae, white snakeroot - Eutreta
Trout Run Trail, Winneshiek County, Iowa, USA
August 12, 2018
Stem gall on white snakeroot, Ageratina altissima

At least two of the host plant's fellow composites, Polymnia canadensis and Eutrochium sp., are similarly galled in my area by Eutreta sp. flies:


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Tephritidae, white snakeroot - Eutreta Tephritidae, white snakeroot - Eutreta Tephritidae, white snakeroot - Eutreta Tephritidae, white snakeroot - Eutreta Tephritidae, white snakeroot - Eutreta