The emerald ash borer (EAB) is a metallic green wood-boring beetle of about 1 to 1.5 cm in length that attacks all native species of ash trees, typically killing them in two to three years. Its larvae bore tunnels under the bark to feed on inner bark tissue. The tunnels cut the flow of nutrients and water to leaves, causing the tree to die. Native to China, this invasive species was discovered in Windsor Ontario in 2002. Since then, the pest has spread into other areas of Ontario and Quebec and to 15 states in the USA.

TreeAzin® Systemic Insecticide is an injectable insecticide formulated with azadirachtin, an extract of neem tree seeds (not neem oil) In Canada, TreeAzin is registered by Health Canada's Pest Management Regulatory Agency (PMRA) (PCP 30559). Ontario's Ministry of the Environment (MOE) scheduled TreeAzin® as a class 4 pesticide or "least hazardous that is commercial", with a class 11 active ingredient. TreeAzin is exempt from Ontario's Cosmetic Pesticide Ban Act

TreeAzin is injected into the trunk and quickly spreads into the entire tree vascular system. The emerald ash borer larva ingests the product which stops the larvae from developing and eventually kills it. On top of that, when the female adults eat the leaves of a treated ash they become sterile.