Pests killing cherry tree?

Hiya can anyone give me a bit of advice please, are these harmless to the fruit? Do I leave them, or is there a safe pesticide i can buy? ...I've been out to water my cherry tree this morning (because I read not to water plants on an evening as I had been) but noticed the leaves were shrivelled and brownish, and everywhere is covered in these tiny beetle like bugs they are probably maybe 2-3mm in size that's all but theres hundreds of them under the leaves and walking up the stalks/branches and trunk....only had the tree since beginning of March.thank you in advance.....I've been googling....could it be a flea beetle? If so any advice on how to get rid of them please?

 

This is common ,don’t quite know which bug it is ,I get it every year.
I just nip all the tips out containing the blighters ,that does it for me.
You may see ants climbing to great heights to eat them too.

 

@roders thank you so much for your reply, yes I saw an ant too but only one when I looked..

Has anyone tried neem oil I've just been reading about that as a safe insecticide?

 

Looks like one of the aphids, which often cause leaves to roll for their protection. Ants "farm" them for the sweet honeydew they produce.

 

@NigelJ thank you so much for that