Black Sticky Mess Under Pin Oaks: Sooty Mold from Aphids/Scale

Black "Ick" on Everything Under Pin Oaks: Insect Honeydew

The black coating is sooty mold growing on honeydew excreted by aphids or scale insects feeding in the canopy. It's not the tree's fault.

Apply Bayer Advanced Tree & Shrub Insect Control (imidacloprid) as soil drench in early spring at bud break.
Roots translocate to leaves; feeding insects die.
One application lasts the season.
Honeydew stops → sooty mold weathers away.

Treat all 9 trees. Neighbor's removals suggest chronic infestation.

Trees: Sooty Mold on Large Trees: Systemic Imidacloprid for Aphid Control; Sooty Mold Lingering After Insect Treatment? Here's What to Do; Borers in Pin Oaks: Not from Pines, Stress Is Key; Black Spot on Large Trees: Rake Leaves, Don't Worry; Tree Identification: Mulberry vs. Poison Oak; Black Film on Multiple Trees: Sooty Mold from Scale/Aphids; Black Rot on Grapes/Apples: No Threat to Walnut Trees; Pin Oak Grove Decline: Drought, Insects, and Galls—Sorting the Damage; Black Mold on Young Tree: Aphids and Sooty Mold Fix; Birch Leafminer on River Birch: Identification and Systemic Treatment

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