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Classification Order: Diptera – true flies Family: Conopodiae

Length .

Phenology

Galls from August to April, or puparium May and June (in old flower head).

Identification

Life Cycle

Urophora jaceana has a larva which initiate a gall on the flower heads of Common Knapweed Centaura nigra which incorporates the receptacle and achenes. The gall is hard and woody; usually affecting most of the capitulum (flower head) usually with several chambers, each with one larva.

Habitat

Proximity to host plant Common Knapweed Meadow Rough Grassland etc.