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River Birch Aphids, Cones, and Sooty Mold: Systemic Insecticide Fix

Three Issues, One Cause

Dripping sap + sticky leaves + black mold = aphid honeydew. "Pine-cone growths" = birch catkins (normal).

Solution for Large Tree

Soil drench with imidacloprid (Bayer Advanced Tree & Shrub Insect Control). Roots translocate to leaves; aphids die. Sooty mold weathers off. One application per season.

Trees: Transplanting a River Birch Near Power Lines; River Birch Near a Pool: Root Concerns & Construction Tips; River Birch & Basement Floor Cracks: Roots Not the Cause at 10 ft Depth; River Birch with Ice-Damaged Trunk: Cable or Remove?; River Birch Defoliated by Caterpillars: Identify, Spray Now, Prevent Next Year; Reviving a Wilted New River Birch; Assessing Survival of a Newly Planted Heritage River Birch; Leaning River Birch: Why Topping Is a Terrible Idea; River Birch Near Driveway/Foundation: Use Dwarf Cultivar; River Birch (Betula nigra): The Four-Season Star for Difficult Sites

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