79a65697_ow_in_Minnesota__Minnesota_DNR__Pest_or_Condition
[Trees] White pine [Recommendations] Prune branches with dead needles or blistered bark. Prune all branches up to 9 feet on stem in southern MN and up to 17 feet in northern MN. [Pest or Condition] 
White pine blister rust
Forest Insect and Disease Newsletter: 5/99: Helping trees grow in Minnesota: Minnesota DNR
Pest or Condition