If the tree is in a landscape with a sprinkler irrigation system, make sure that water is not spraying the needles. Sinclair, W.A., H.H. Severely affected trees may require more years of treatment. Use pesticides selectively and carefully and follow recommended procedures for the safe storage and disposal of surplus pesticides and containers. *We will never send you spam or share your info.Unsubscribe at any time. The Rhizosphaera pathogen sporulates in the spring (Fig. ), 8 oz. Please contact site owner for help.