79a65697_ow_in_Minnesota__Minnesota_DNR__Pest_or_Condition
[Trees] All [Recommendations] Spray with a labeled insecticide when damage is unacceptable. Bt is preferred for caterpillar control. [Pest or Condition] 
Leaf-feeding caterpillars, lacebugs, leaf beetles, aphids, and externally-feeding weevils
Forest Insect and Disease Newsletter: 5/99: Helping trees grow in Minnesota: Minnesota DNR
Pest or Condition