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White Birch Leaf Drop with Dark Spots: Fungal Disease Likely

Two 4-year-old white birches losing excessive leaves with dark pinpoint spots, yellowing, and drop despite annual Bayer Advanced treatment: insecticide doesn't control fungal leaf diseases (e.g., anthracnose, leaf spot).

Treatment

Spray Daconil (chlorothalonil) fungicide on foliage.
Repeat in 10 days.
Monitor for reduced defoliation.

Care

Water deeply during drought.
Mulch to conserve moisture.
Rake and destroy fallen leaves.

Birches are prone to foliar fungi; annual spring fungicide program may be needed in wet years.

Plant Diseases: White Mushrooms Under Blue Oaks: Mycorrhizal or Parasitic? Identification Needed; White Birch Buds Fail to Open: Cold Snap Damage; White Birch Decline After Spring Pruning: Sap Flow and Bacterial Wetwood; White Powder on Birch Leaves: Powdery Mildew or Insects?; River Birch Yellowing and Black Coating: Aphid Honeydew and Sooty Mold; Plum Tree Soft Bark Bumps: Scale Insect Infestation; Mature White Oak Hypoxylon Canker: Stress Management; Transplant Shock in Oversized White Pines: Root Stimulation?; Old White Birch Top Dieback After Frost: Assess, Prune, or Replace; Aphid Honeydew on Silver Birch: Autumn Diagnosis and Spring Management

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