About Eutreta diana (Osten Sacken, 1877)
Eutreta diana is a species of fly classified in the family Tephritidae. This group is referred to as fruit flies in North America and picture wing flies in Europe. This species is distributed across Canada and the United States. In western North America, female Eutreta diana lay their eggs inside the vegetative buds of multiple species and subspecies of sagebrush. After hatching, larvae induce the growth of woody galls close to the original oviposition site. The larvae feed internally on the host plant inside the gall until they reach maturity. The growth of these galls aligns with the spring seasonal growth of sagebrush, and Eutreta diana produces only one generation each year. According to a description published by Goeden in 1990, adult Eutreta diana have pale green eyes, black wings marked with white dots, and bright red abdomens.
