Firewood and nursery stock are restricted from leaving the quarantine zone which now includes all or parts of 31 states, Washington, DC, and Ontario and Quebec.
According to the U.S. Department of Agriculture’s Animal and Plant Health Inspection Service (APHIS), since its discovery in southeast Michigan in 2002, emerald ash borer infestations have been detected in Alabama, Arkansas, Colorado, Connecticut, Delaware, Georgia, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maryland, Massachusetts, Michigan, Minnesota, Missouri, Nebraska, New Hampshire, New Jersey, New York, North Carolina, Ohio, Oklahoma, Pennsylvania, South Carolina, Tennessee, Texas, Virginia, West Virginia, and Wisconsin.
Beginning in 2007, APHIS initiated a search for potential biological control agents in China. Most recently, in 2015, the stingless wasp, Spathius galinae, was released. Efforts are ongoing to find and evaluate additional biological control agents.