ArborSystems Retriever Insecticide is a neonicotinoid much like other pesticides but the active ingredient is Acetamiprid. This active ingredient has a high LD50 which means that it doesn’t have the “bad” characteristics of other neonicotinoids. For example, it is 400-600 times less toxic to bees. Acetamiprid has been specifically omitted from neonicotinoid lists whenever bee toxicity is mentioned. But it has the good characteristics of an insecticide in that it can be used for tree treatment of borers, hemlock wooly adelgids and scale insects (see label for a complete pest list). For more information, click here.