| Bronze Birch Borers can be controlled if the infestation is not too large and the tree is relatively healthy. You have a choice between spraying the tree or using a systemic insecticide. Between mid-May and mid-June, you can spray infested trees with permethrin (Eight) or Spectracide Bug Stop to kill adults emerging from the bark and feeding on leaves. Or, a soil drench of systemic insecticide between mid-May and mid-June can kill adult borers as they feed on leaves, or as they try to enter or leave the tree. Soil drench applications can kill young larvae that are already boring into trees. You can use use dimethoate (Cygon, De-fend) or Imidacloprid (Bayer Advanced Garden Tree and Shrub). Good luck with your project! |
