White fur may be woolly aphids. If the "fur" is very sticky then you need an insecticide unless you are an organic gardener. This also depends on what country you are in as many systemic insecticides...
apple trees have to be at least 300 degreaseThe height of the tree, or even the angle of growth do not matter. An apple tree grafted on a rootstock should carry some fruit in it's second year. A tree...