Crape Myrtle Black Leaves: Sooty Mold from Aphids

Crape myrtle leaves turning black.

Cause: Aphids → Honeydew → Sooty Mold

Spray foliage with contact insecticide (acephate, bifenthrin, malathion, etc.).
Or systemic soil drench: Bayer Advanced Garden Tree & Shrub Insect Control (imidacloprid)—season-long.

Control aphids; mold disappears.

Plant Diseases: Watering Newly Planted Crape Myrtles in Extreme Heat; Crepe Myrtle Leaf Drop: Environmental Stress Rather Than Disease; Crepe Myrtle Bark Insects: Moth-Like Bugs and Nutritional Imbalance; Troubleshooting Leaf Curl and Scorch on Young Crape Myrtles; Lichen on Roof Shingles: Baking Soda or Copper; Dandelions in Periwinkle: Weed-and-Feed Risks Killing Groundcover; Orchid Fungicides and Insecticides: Consan 20, Cygon 2E, and Homemade Oil Soap; Lichens on Trees: Symptom, Not Cause of Decline; Insecticide Sprayers: Safety, Coverage, and Choosing the Right Model; Whitefly Control on Gardenias: Spray Thoroughly or Use Systemic in Spring

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