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Sweetgum Leaf Diseases: Anthracnose and Leaf Spot in Humid Summers

Premature fall color with black spots on sweetgum leaves indicates fungal disease—either sweetgum anthracnose (Gloeosporium nervisequum) or sweetgum leaf spot (Cercospora liquidambaris). Hot, humid July/August weather triggers outbreaks. Similar fungi affect maples, poplars, and dogwoods. Trees look rough but rarely die from these foliar diseases.

About Gardening: Forsythia Saturated Soil Decline: Drainage and Renovation; Vinca Sudden Death: Root Rot Diagnosis and Fungicide; Jacaranda Leaf Drop in Daytona Beach: Normal Spring Cycle or Stress?; Orchid Blooms Dying as They Open: Three Main Causes; Why Did Filtered Water Kill My Cut Roses Overnight?; Indoor Palm Decline in British Columbia; Petunias Dying Suddenly? Crown Rot from Sprinkler Overwatering; Window Box Petunias Dying Suddenly? Check for Virus or Overwatering; Desert Container Seedlings Dying in 100°F+ Heat; Preventing Damping-Off in Indoor Squash Seedlings

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