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I grow all my carrots in willow planters which are a height of about 18 inches. I have never had trouble with carrot fly as I think they fly lower to the ground than this.
It's true - carrot fly cannot reach above about 18 ins but most important, when thinning or picking carrots try not to disturb the foliage too much and NEVER leave a bit of leaf laying on the ground. Pick up every scrap and take it far away from the remaining carrots. The broken foliage gives off a heavy scent which the fly picks up on.
I put my carrots between tall growing veg like sprouts and haricot vert and take a softly, softly approach to thinning, harvesting and weeding around them. I also grow a row of marigolds alongside. So far this seems to work for me.
This year i planted a row of tagetes then a row of chives either side my carrot plot and so far .....touch wood no fly looks pretty tooo
Hi,thnx for all tips and info,,just getting things ready for new season ,,patch for brassicas all limed and root crop area dug over wth added sand for carrots,,spuds given lots manure,,this place be like a jungle ,,haha,,,yeah ok,,,
Hi Simmo have you tried putting a piece of rhubarb under your brassica plants, about two inches long,pointing up. this method was given to me by my father. i have had agreat deal of sucess, but it does not work on all soils. best of luck Wuz
I read about planting carrots between rows of onion and garlic and it worked - no carrot fly - where as the allotments around me suffered
I have also been told that you can hoe carrots up but not tried this