79a65697_ow_in_Minnesota__Minnesota_DNR__Pest_or_Condition
[Trees] Apples, crab-apples, pears, mountain ash [Recommendations] Remove infected branches 4-6 inches below visible infection. Apply copper compounds when buds are showing 1/4 inch green tissue. During bloom spray streptomycin at 3 to 4 day intervals to inhibit bacterial growth and reduce blossom infection. Disinfect pruning tools with diluted bleach after each cut. [Pest or Condition] 
Fireblight
Forest Insect and Disease Newsletter: 5/99: Helping trees grow in Minnesota: Minnesota DNR
Pest or Condition