A Michigan dogwood retained dead leaves all winter and showed thinning canopy. Classic signs of dogwood anthracnose (Discula destructiva), a serious fungal disease.
If high risk or confirmed: myclobutanil (Immunox), propiconazole (Banner), or chlorothalonil (Daconil) at bud break and per label. Consider resistant Cornus kousa for replacement.
Dogwood Leaf Scorch in Sandy Soil: Environmental Stress, Not Fungus
Dogwood Decline with Moss: Anthracnose or Stress?
Dogwood Leaf Scorch: Water, Mulch, Shade for Establishment
Dogwood Tree Care: Soil Testing Before Amendments
Retaining Wall Near a Mature Dogwood: Why 10 Inches of Fill Will Kill It
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