from what i understand, it's best to just stay on top of your trees until you have a problem, then address it.. i.e., if you properly identify apple maggots, then get an appropriate insecticide.. don't just spray them for the sake of spraying.. you need to be spraying for something... $aves money too! i'm planting 100 next spring on bud 9 (dwarf) i'm new to this, but read as much as i can on apples...i'll post some questions for the pros here next year 