Lilac Ash Borer

The adult Ash Borer (or Lilac Borer, not to be confused with the Emerald Ash Borer) is a clear-winged, day-flying moth that closely resembles a wasp. The adults emerge in August or September and deposit eggs on the bark of the lower trunk. The larvae hatch out, then bore through the bark and feed within the branches and trunk of the tree until the following fall, when they emerge as adults.