By Frankmadge
United Kingdom 
I have just notice that there are BLACK things under the leaves of one of my cherry trees, what is it, and what can I do
14 May, 2017
Answers
Hi
Sounds like aphids are the leaves curling up as well ?
I have in the past washed them off with the hose pipe as they were high up in the tops of my trees , but as Moon grower has asked a photo is the best way to help to identify if possible.
14 May, 2017
Could be scale too. Ditto : Really need a photo.
14 May, 2017
Could you add a photo to your question as it will make i.d.ing much simpler - thanks
14 May, 2017