Homeowners who want to protect their ash trees from the destructive emerald ash borer should have trees treated no later than mid-May, a Purdue Extension entomologist says.
Adult borers soon will emerge from ash trees and begin feeding on them and laying eggs, so it is best to apply insecticide treatments to ash trees before this occurs, Cliff Sadof said. "This ensures that beetles are killed before they have a chance to lay eggs on the trees," he said. Sadof expects to see EAB adults emerging by the end of May.
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For more resources you can visit the Purdue Extension EAB web site.