Steve Harris wrote:

My vegetable plot is totally enclosed by walls/fences 6' high. I've just
lifted a trial crop of carrots which are completely clean. No
precautions were taken against Fly. I'm encouraged!

Is this just luck or have the walls/fences done the job of keeping out
the low flying pest?

Thanks!

Steve Harris - Cheltenham - Real address steve AT netservs DOT com
A useful bit of gardening software at http://www.netservs.com/garden/
My first crop of carrots were excellent, but the two subsequent years
useless, or almost so. They were very badly damaged by carrot root fly
the second year, so this year I covered them with agricultural fleece.
No root fly but a very poor crop of carrots, so next year? Not sure.