late winter - prune while dormant, spray with dormant oil
Very early spring - fertilize
Immediately after petal fall (blooming done): spray.
Fruit set - thin fruit to one every six inches. You'll get less fruit number wise,but bigger fruit
Summer - continue to spray, spray spray. Most guys aren't going to spray at separate times for mites, scabs, fungi, insects. Use a four in one spray.
Fall - pick fruit. clean up crappy fruit at base of tree and get rid of it so its less attractive to bugs.
Do not fertilize summer. It encourages green fresh growth too late in the year, doesn't harden off, and winter kills.
Commercial operations spray very frequently, often weekly if weather has been wet. Use mowing or roundup to control weeds/grasses.
Dormant oils are not pesticide per se. Rather, it simply coats and smothers insect eggs before the bastards hatch. Lime sulphur spray is thought to 'encapsulate' some spores and other microorganisms if I remember correctly (could be wrong). Used on raspberries too. But use it when leaves are budding and you damage plants'