my apple trees are 4 years old this year on 2 out of the 3 tress iv only got 2 small apples form one of them and about 6 from the other that were cracked what is the name of the white paint iv seen on some other peoples apple tree ,s ,iv this year put plenty of home compost at the base of my trees is there any thing else i can do to get a good harvest of fruit this year
Feeding with rich compost or manure will exacerbate the problem.
Control all weeds and grass under the trees. Feed in March each year with fruit fertriliser and spary for apple scab disease.
Improve shelter if you can.
Paint on the trunk is of no benefit.