Carrot fly

After swearing I will never grow carrots again, as a result of them being ruined by legions of carrot fly over the years, I have just sown two rows! They are just coming through and I decided to make a kind of cloche over them using fleece. Is this a good idea or is there a better method of beating the little ######?

 

Thanks for that Marley Farley. Too late to do that this year as they are already coming up, but will try next year. mind you how close would the onions need to be as I have 100 onions and about 36 shallot plants on the other side of the path, say about 4' from the end of the carrot row.

 

If you can, plant them high up in a raised bed of some kind. Carrot flys only fly about 2 feet above ground level. I've built a raised bed and have sown plenty of carrots, so fingers crossed.