I use the safest products available. For these caterpillars, I use Conserve, active ingredient Spinosad which is organic. This product is very effective and completely safe for all mammals, birds, reptiles, amphibians etc. It is made from a bacteria and has a unique mode of action that only affects insects. As such, it carries no caution label which almost unheard of. Also, I have a powerful sprayer and can reach the tops of our tallest trees.