A 5-year-old Dwarf Japanese Maple near Dallas showing sudden leaf loss, foliage film, and mossy trunk growth likely has Verticillium wilt—a soil-borne fungal disease that blocks vascular tissue. Excessive humidity and poor drainage create favorable conditions.
Immediate action: prune out all affected branches, cutting into healthy wood. Sterilize tools between cuts. Apply high-nitrogen fertilizer to stimulate new growth. Improve drainage around the root zone if soil stays wet.
Long-term: the fungus persists in soil. If the tree declines, replace with a resistant species. Avoid planting susceptible maples, redbuds, or smokebush in the same location. Mulch properly (2-3 inches, not against trunk) to moderate soil moisture.
Confirm diagnosis with a local arborist or extension service—other issues like root rot, borers, or chemical damage can mimic symptoms.
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