apple tree problem

My Friends has to apple tree one of then as had stun growth and the leaves are on the sad side !!
any idea what is wrong ??

thank you

JS

Looks to me like aphids. I think I see exoskeletons and the black stuff on the leaves is aphid droppings. A severe case can cause leaf curl and stunting like that. Plenty of home remedies (soapy water, blast it with a hose, etc) will take care of it or neem oil works great and is natural.

Thanks Kelby I are going to try the neem oil !

JS

Might also be fire blight?

http://www.caf.wvu.edu/kearneysville/disease_descriptions/omblight.html