Canada thistle gall fly

Canada thistle gall fly

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Credit: DR. JOHN BRACKENBURY/SCIENCE PHOTO LIBRARY

Caption: Canada thistle gall fly. Close-up of a Canada thistle gall fly (Urophora cardui) on a flower. This fly is indigenous to Central Europe from the United Kingdom east to near the Crimea, and from Sweden south to the Mediterranean. It's larvae form galls (swellings) in the stems of creeping thistle (Cirsium arvense) plants. As a result these flies have been introduced to North America to help control the spread of these plants. Photographed in the UK, in July.

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Keywords: 1, animal, animals, biological, biology, britain, british, canada thistle gall fly, close-up, detail, diptera, dipteran, entomological, entomology, europe, european, fauna, flora, flower, fruit fly, insect, insects, invertebrate, invertebrates, june, nature, one, picture-wing, picture-winged fly, plant, single, summer, tephritidae, uk, united kingdom, urophora cardui, wildlife, zoological, zoology

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