The larva of the fly Amauromyza verbasci causes a blotch mine on the upper surfaces of the leaves of Mullein, Common Figwort and Butterfly Bush. The mine initially is pale, turns brown later. Frass in sizeable dispersed grains. The mine is seen more often than the adult fly.
Leaf mines may be recorded wherever the host plants are found.
Mines may be seen in summer and early autumn.
Widespread in England but not well recorded.
Status in Leicestershire and Rutland not known.
Leicestershire & Rutland Map
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