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Infected leaves often feel sticky, and the sap can be colonised by black sooty mould. Bad infestations can leave a plant vulnerable to attack by other pests and diseases. Virus diseases can be spread by black-fly as they move from one infected plant to another.

Spot them

Part of the aphid family, black-fly are about 2mm long, black, round and full of sap.

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black and green fly on my pea plant

Comment from duncan cairns

does diluted fairy liquid damage the pea plant when used to treat green and black fly

  • Views: 901
  • Replies: 2
  • Posted: Wed. 17th July 2013 18:28
  • Last reply: Thu. 18th July 2013 13:51

Black fly-organic control

Tip from Susie H.

Dear Faye,
There is a 'friendly' midge that eats blackfly--Aphidoletes aphidymyza, which you can order.
Or you can spray it regularly with dilluted Fairy liquid.

  • Views: 1425
  • Replies: 0
  • Posted: Tue. 12th August 2008 10:46

Organic way to get rid of black fly?

Question from Faye Wimpenny

I have a philadelphus that is covered in black fly. Is there any way I can get rid of them with out using pesticides as I also have quite a few ladybirds eating them but not fast enough!

Thanks faye

  • Views: 5943
  • Replies: 2
  • Posted: Thu. 29th May 2008 17:38
  • Last reply: Mon. 2nd June 2008 13:08