I've been told to follow up an infestation of apple scab by composting any leaf litter on the orchard floor to destroy spores. I plan to haul away most of the leaves to my garden composter but a 5% ...
This answer recommends putting down a layer of compost mulch in the fall in order to slowly feed the tree. (In addition to the unmentioned weed control and moisture regulation.) It makes sense to me ...