And There's More
I bagged apples on three different trees, and found that the method is most valuable on our midseason tree, which always faces the most severe pest pressure. Our early and late apples did not benefit from bagging with plastic or tulle enough to make it worthwhile. In the future, I will bag the 'Enterprise' apples more aggressively but not bother with the early 'Williams Pride' or late 'Liberty', which naturally escape serious insect problems. In my area of Southwest Virginia, they are the easiest apples to grow without spraying.