Baz wrote:
A young couple have just sown some carrot seed this morning on their
plot on the allotment. They say that this is when the young lasses father
and grandfather used to sow them to avoid the fly. They will not be
covering them because the fly threat is gone.
I have done the same as them after the info they gave.

I have heard the same, although I think I read that you can do them a
lot easrlier than now to avoid fly, around end of May.

Not that there's much credence in anything I say regarding carrots.
My track record is ... not good.