Sooty Mold on Shrubs: Fall Cleanup and Winter Strengthening

Managing Honeydew-Derived Fungal Growth

A gardener has sooty mold on front-bed shrubs with black flies summer-long, asks if waiting until spring for horticultural oil is safe.

Horticultural soap/oil hose-end spray NOW – Wash off mold blocking photosynthesis
Fall fertilization – Strengthen plants for winter
Spring preventive oil – Continue control

Sooty mold weakens plants; fall cleanup critical.

Shrubs: Controlling Sooty Mold on Tulip Trees by Managing Aphids; Heeling In Sale Shrubs for Winter on Long Island; Renovating Overgrown Boxwood Shrubs: Gradual Pruning; Cedar Shrubs in Planters: Long-Term Care and Overwintering; Transplanting Blue Rug Juniper & Crape Myrtle in Atlanta: Wait for Fall; Overwintering Container Shrubs in Cold Climates: Blueberry and Arborvitae; Arborvitae Row with Center Dieback: Drainage Problem Suspected; Repeated Arborvitae Failure in Maine: Soil Drainage and Fertilizer Errors; Normal Interior Browning in Newly Planted Arborvitae; Heeling In Shrubs During Construction: Preserving Plants for Replanting

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