Hot but normal for tree. 3 days ago leaves curled, light green, now dry and dead. Branches bendy.
Ulmus parvifolia durable (zones 4–9). Sudden decline suggests trauma. Likely root/soil issue, not infectious disease. Check soil moisture (moist not wet). Look for trunk bark injury (mower/trimmer = death sentence). Check leaves for insect feeding. Scratch twigs for green tissue to gauge releafing potential.
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