Answered by Jo Posted in Category Pest Control & Nature

Dear Jo

Is it advisable to dust the ground with somthing prior to sowing carrot seed, just in case carrot fly larvae are in the ground when i put my covers on?  Thank you.


Dear Percy

It is a good idea to practise crop rotation with your carrots.  Carrots grown in the same spot as last year may be susceptible to attack from pupae that has overwintered in the soil.  Moving your crop each year should prevent this from occurring.

There is a Nematode available that can be watered into the soil to kill any larvae that are hiding there.   In the Kitchen Garden we also use Carrot Root Fly Traps to give us an idea if the flies are present.  This helps you time your application of the nematodes.

When you put your covers on they should be 2 feet high and it’s a good idea to use an insect mesh to stop the flies getting in.

Good luck.  Here’s hoping for a root fly free year!

Kindest Regards


Meet the Author: Jo Blackwell
Jo Blackwell

Jo Blackwell is our well-established Horticultural Advisor and the Kitchen Gardener in Stephanie's Victorian style Kitchen Garden. She caught the gardening bug when she bought her first home 21 years ago. Her first greenhouse soon followed and she later gained an allotment.

As well as tending the Harrod Horticultural Gardens, she enjoys maintaining her own vegetable plot at home. She has been a gardener for Harrod Horticultural for over 4 years now and has a wealth of experience in organic vegetable growing, ornamental gardening and in using all Harrod products.


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