Leaves may be blighted and drop. See section on Crown Gall. Reported on lantana in Texas. Anthracnose is characterized by brown, necrotic lesions that usually appear along leaf margins and leaf tips. Foliar wetness can intensify infection and subsequent damage.
Protective fungicides can help reduce damage if persistent, severe infection occurs.
Remove spotted leaves. Whitish, powdery mold patches on upper side of leaves and stems from midsummer on. Leaves may shrivel and drop early. Control with recommended fungicides. Serious losses to phlox seedlings occur from these soil-borne fungi.