re: Peach Tree question

It really depends on the kind of insect pests you have, but here are some general things you can do if you want to spray pesticides.

Sometimes you can control effectively by spraying something like spinosad during the winter and that'll kill all the caterpillars that are overwintering on the branches. You could also spray spinosad just after the flowers bloom and then a week later. The important thing is that you kill the larvae before they get into the fruit, otherwise any pesticide application you do is worthless.

Spinosad is just one pesticide you can use but it is a nice low toxic pesticide which makes it well suited for residential areas and it also affects a large variety of insects. You should also always follow the directions on the label.