wrote in
:

Enviromesh is now a widely used product for the control of carrot
fly.

http://horticulture.taylorschoice.co...p?s=enviromesh


Try this link, I got 3m by 50m for £50 delivered to my door and I was free
of carrot fly last year, as well as cabbage maggot, caterpillars etc.
There was enough to cover everything at risk on my allotement.

http://www.tildenet.co.uk/acatalog/Debris_Netting.html