AceCap systemic insecticide implants are ideal for larger trees with a trunk diameter of at least 8 inches.These implants contain acephate, an eco-friendly insect control supplement. Use acephate to control emerald ash borer beetles and a host of other insects.These implants remain safely inside the tree. The flow of sap distributes the contents systemically throughout the tree. The outer bark eventually forms a callous over the implant site.10 implants will effectively treat up to a 14-inch diameter tree. AceCap is an effective and easy-to-use treatment for both professionals and home gardeners.This pack contains 50 implants.