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UK Nature > Galls > Thistle Gall
Gall causer: Urophora cardui
Common Name: Thistle Gall
This gall is caused by a small but striking fly, Urophora cardui. It flies from May to August/September and it lays its eggs on Creeping Thistle, Cirsium arvense. After hatching, the larvae burrow into the stem of the plant and form a gall.
During maturing, the larva will reach 98% of its full body weight, and appear as an adult. The larvae pupate in early spring for 24 to 35 days, and appear reddish brown, but are still inside the gall. The fly goes through a tunnel formed in the gall during June to October. Widespread and fairly common in the south of England.
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