I will be painting my peach trees with something this weekend, trying to keep the sap from flowing too soon. The only thing I have seen about insects is that it makes it easier to see the "frass" when boring insects are attacking the treeI read in my apple tree pruning book that the author uses watered down white latex paint to deter insects. I guess the bright white hurts their eyes. I do have trucks wrapped to stop rascially rabbits.