Timing Treatment
Dormancy delayed dormant (early spring) Foliar copper sprays.
Petal fall
Shuck split
FireLine17WP when conditions favor disease.
(mid summer) 
FireLine17WPat weekly intervals as disease conditions warrant. Consider alternating or tank mixing with copper based products. Note: certain liquid copper formulations may be incompatible with FireLine 17.
Post harvestdormancy
(late fall – winter)
Pruning to remove overwintering of cankers from trees.

Note: Check with your local extension agent and/or Pest Control Advisor for specific recommendations.