Sooty Mold on Large Trees: Systemic Imidacloprid for Aphid Control

Two large trees covered in black leaf fungus. Too tall to spray. Systemic chemical? Sticky leaf drop is messy.

It's Sooty Mold from Aphids

Black coating = sooty mold on aphid honeydew. Systemic soil drench: Bayer Advanced Garden Tree & Shrub Insect Control (imidacloprid).

Plant Diseases: Blue-Gray Growth on Tree Trunks: Lichens—Harmless, Indicate Light, Not Cause of Fruit Tree Decline; Black Trunk Coating on Mulberry Trees: Sooty Mold; Why Maple Tree Bark Turns Black: Fungal Infestation Explained; Green Mold Spreading Across Citrus and Olive Trees: Identification and Treatment; Black Knot on Flowering Plum/Cherry: Prune and Spray; Black Mold on Young Tree: Aphids and Sooty Mold Fix; Treating Borers in Young Black Locust Trees; Diagnosing Two Problem Trees: Borer and Canker; Lichen on Japanese Maple and New Trees: Harmless Epiphytes, No Treatment Needed; Black Mold on New Lawn: Identification and Treatment

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