White fungus on apple tree
There's a white fungus growing on the trunk of my apple tree and I'd like to know if and how I can get rid of it. The tree is probably fairly old, but still produces good fruit and is the centerpiece of our yard, so we're quite worried about it. I've tried spraying down the trunk with water and that kind of blasts away the fungus for a little while, but it has come back a couple times already (usually after a couple of weeks). It also seems to be creeping higher onto the tree, getting into the branches a little. Help!