New shed and greenfly, possibly?

andy.1.lawson

Hi - hoping you can help! I’ve recently had a new shed installed which sits below a large horse chestnut tree. Since the shed was installed I’ve had what look like greenfly attracted to it (see pictures) all inside and outside.  

Any ideas to remove these would be great as the inside of the shed is covered.

Thanks in advance.  Andy

Liz.S.

Your shed is nice but the greenfly are not attracted to it, the are falling/flying down from the chestnut tree.

Sweep them off/out.