Lilac borer is a clear-wing moth that can damage lilac, ash, and privet trees and shrubs by burrowing into the heartwood.
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Lilac borer (Podosesia syringae), also known as ash borer, is a clear-wing moth that is native to North America and widespread in the U.S. The larvae tunnel into the trunks and lower branches of lilac, ash, and privet. Trees stressed by drought, injury, or recent transplanting are especially susceptible to borers.
We forecast adult emergence based on growing degree days. Adult lilac borers overwinter in the heartwood of trees, then emerge in early summer. Trunk sprays should take place preceding or coinciding with adult emergence and subsequent egg hatch to kill larvae before they enter trunks. For specific information on preferred treatment options in your region, we recommend contacting your local extension agent. For more information, visit UMass Amherst Center for Agriculture, Food, and the Environment or Colorado State University Extension
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