Kay from Madison, Ms 39110 writes
An insecticide would not be an effective treatment for a fungus on a tree. Eagle 20EW Specialty Fungicide would be the recommended product for treating powdery mildew on crepe myrtle trees at the rate of 0.06 - 0.12 fl. oz. per gallon of water per 1,000 sq. ft., sprayed directly onto the tree. You can refer to the product label for complete application instructions. If you are seeing black sooty mold on the tree, then then the Ferti-lome Tree and Shrub Systemic Insect Drench could be applied to help treat the scale insects which cause the secondary issue of black sooty mold.
Answer last updated on: 04/12/2021
