Kentucky Office of the State Entomologist
HWA is a threat to eastern hemlock forests, and eastern and Carolina hemlock of all sizes are susceptible. Kentucky has a significant hemlock component throughout its eastern forests, all of which could become infested.
HWA was first reported in the eastern US in Virginia in the mid 1950's. Since then, it has spread north to Connecticut and south through North Carolina. It reached eastern Tennessee in 2002, and was first reported in eastern Kentucky in spring 2006. The infested area expands at the rate of about 15 miles per year. HWA can be blown by winds, carried by birds and other wildlife, and moved on infested nursery stock. It produces several generations per year and has an extremely high reproductive potential (up to 300 eggs per female) so numbers can increase rapidly in a short time.
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