How to Protect Carrots from Carrot Fly

If you have yet to experience that awful sinking feeling of lifting carrot after carrot riddled with dark crevices, tunnelled out by the dreaded carrot fly larvae, then consider yourself lucky. But for those of you that have, fear not! Haxnicks have been fighting various garden pests for over 20 years, and have picked up a few tricks along the way...

How to protect your Carrots from Carrot Fly with Haxnicks
Image courtesy of www.morguefile.com

But first... some facts about carrot fly:

  • Carrot fly also affects other vegetables in the parsley family, such as Parsnip, Celery, Dill, Coriander, Fennel and Celeriac
  • They are attracted to the smell of bruised foliage
  • The larvae that damage the roots can continue to feed through the autumn into winter, moving between plants
  • The adult carrot fly is approximately 9mm long.  It is a slender, metallic, greenish-black fly with yellow legs and head. Larvae are creamy white, tapering maggots

How can you tell if your carrots are infected? - Check for reddening of the foliage and stunted growth

 

So now we know a little bit about the pest itself, we can look at some of the ways which we can protect our crops from infestations:

  1.  Make sure to avoid using previously infested ground. Carrot fly larvae are capable of surviving through the winter, so avoid re-sowing any vegetable from the Parsley family (see above)
  2. Avoid sowing during the main egg-laying periods, which are (for most parts of the UK): mid-April to the end of May & Mid-July to the end of August.
  3. Sow disease and pest resistant varieties such as Fly Away F1 and Resistafly F1, available from garden centres and online seed suppliers.
  4. Erect a fine-mesh barrier at the time of sowing – at least 70cm high. Check out our Micromesh Pest & Wind Barrier which will work for containers and open ground.  Or a Micromesh Tunnel - with 0.6mm netting it will keep the Carrot Fly from getting to your precious crop.
  5. Sow thinly so as to avoid ‘thinning out’, releasing the smell of bruised foliage
  6. Thin out or harvest on a dry evening with no wind – or use scissors so that no bruising of foliage occurs
  7. Try companion planting - growing varieties of pungent Rosemary, Sage or Marigold as a deterrent/’smokescreen’
  8. Grow your carrots in planters taller than 70cm - for example the Haxnicks Oxford fabric planter or Carrot Patio Planters
  9. Lift main carrot crops by Winter, especially if any are infected – don’t leave them in the ground to serve as food for overwintering larvae.

Thinning out tip: Use scissors to avoid bruising the foliage (and releasing the carrot-fly attracting scent)

To find out more about carrot fly, and the other pests that may arrive in your garden check out Pippa Greenwood's excellent RHS book for plant by plant advice on Pests and Diseases

Have you any experience of carrot fly damage? What do you think went wrong? Please let us know your thoughts using the comments section below.

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