Canada Thistle Gall Fly

by Ian Bushell

This afternoon, I found these galls on the Creeping Thistle in the second set-aside in Village Green. They are caused by Canada Thistle Gall Fly, Urophora cardui. This is a very distinctive fruit fly which, despite its name, is indigenous to the UK and Europe.

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A marmalade hoverfly (Episyrphus balteatus) feeding on the nectar of a bramble flower. This is a new species for our lists, despite its ubiquity.

The marmalade fly gets its name from its colour, and its thin cut/thick cut dark stripes, just like marmalade.

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