Diagnosing Sudden Leaf Drop on Copper Beech

A copper beech (Fagus sylvatica 'Purpurea') leafed out in spring, then all leaves fell within a week. No other plants affected. Owner wants to confirm death before removal and understand cause.

Scratch test for life: Start at top twigs. Scrape bark with fingernail/knife. Green = alive; Brown = dead. Work downward until green is found. Prune dead wood above that point. If no green anywhere, tree is dead.

Possible causes of sudden spring defoliation:

• Late frost: Tender new leaves killed; tree may refoliate if buds survive.
• Root/vascular disease: Phytophthora root rot, beech bark disease (Neonectria + scale), verticillium wilt.
• Herbicide drift: Spring-applied lawn weed killers (2,4-D, dicamba) cause rapid defoliation.
• Girdling root/construction damage: Sudden hydraulic failure.

If dead, remove and grind stump. Before replanting, diagnose cause (soil test, root inspection, arborist consult) to avoid recurrence. Beech prefers deep, well-drained, slightly acidic soil—avoid wet, compacted, or alkaline sites.