Purple-Leaf Maple Leaf Curl: Insect or Water Stress?

A purple-leaf maple (Acer palmatum cultivar) in clay soil shows sudden leaf curling (like a closed hand) with dry appearance but retained color over 6 days. Owner seeks diagnosis.

Rapid onset suggests insect infestation rather than water stress. Check curled leaves for:

• Aphids: Clusters on undersides, honeydew, ants.
• Leafhoppers: Tiny, wedge-shaped; cause curling and stippling.
• Mites: Microscopic; cause bronzing, webbing, curling.
• Scale insects: Bumps on stems/petioles; often overlooked.

If insects found, take samples to extension for ID and targeted treatment.

If no pests, test soil moisture at 6–8 inches. Clay holds water; overwatering causes root rot with similar leaf symptoms. Water deeply but infrequently—1 gallon per inch of trunk diameter, 3×/week for a month only if soil is dry at depth.

Sudden curling + dry texture = likely insects. Gradual wilting + wet soil = likely root issues.