Black mildew on low bushes under crepe myrtle comes from aphid honeydew falling from the tree. Control aphids on the crepe myrtle; mold on bushes will weather off.
Spray crepe myrtle foliage for aphids (systemic or contact). No fungicide needed.
Crape Myrtle Establishment: Overwatering Correction and Fungal Prevention
Crape Myrtle Dropping New Limbs: "Crape Murder" Aftermath
Loblolly Pine Sooty Mold: Aphids, Not Disease
Choosing a Dwarf Crape Myrtle for Zone 6b: Hardiness and Pruning
Deadheading Crape Myrtle for Repeat Blooms
Identifying and Treating Wood-Boring Beetles on Crape Myrtle
Crepe Myrtle Moss and Weevil Larvae: Spray Orthene, Remove Moss
Crepe Myrtle Seedlings: Expect Variation from Hybrids
Brown vs. White Mold on Roses: Identification Needed for Treatment
Crape Myrtle Training: From Bush to Tree Form on Long Island
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