How can I get rid of lichen and moss from my apple tree?
First off, know that lichen and moss are NOT harmful to the tree. So there is no need to remove it unless you feel that it is unsightly or not asthetically pleasing. If you still would like to remove it don’t scrape it because you can damage the bark and hence the tree, pick up a moss killer from the store and either sprinkle it on (if in powder form) or spray it on (if in liquid form) to the tree. It will not harm the tree or other plants, moss killers only kill mosses and algeas.
I’m not sure why you would want to remove the moss and lichen. Trying to remove them will only harm the tree. Actually they are indications of pure air but also lichen on a tree indicates that the tree may be in declining health. Lichen is a combination of algae and fungus and grows very very slowly. Moss is an indication that there needs to be some better air circulation on that tree. Consider a good pruning in early spring. GET that tree on a regular feeding schedule and water in times of drought.
