Leaf spots on established eucalyptus are common and rarely serious. They're caused by various fungi/bacteria favored by wet weather and poor air circulation.
Only if: repeated defoliation, tree stressed, high value. Apply at bud break next spring (chlorothalonil, copper, mancozeb). Current spots won't be cured.
Next year's weather may bring no spots at all. Don't over-treat.
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Phyllosticta Leaf Spot on Young Maple
Tar Spot on Silver Maple: Management and Perspective
Japanese Maple Leaf Spots: Phyllosticta Fungus — Mostly Cosmetic
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Diagnosing and Treating Crabapple Leaf Spots and Defoliation
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Honey Locust Leaf Drop: Root Stress from Weather Extremes
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Sticky, Curling Leaves on One Side of Tree Rose—Aphids
Dollar Spot on New Sod: Fungicide, Fertilizer & Water Timing
Aglaonema Disease Management: Anthracnose, Bacterial Leaf Spot, and Nutritional Disorders
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