Stopping Oak Acorns: Ethephon Spray at Flowering

Pruning Increases Acorns—Use Hormone

To drastically reduce acorn crop:

• Spray ethephon (Florel®) during flowering.
• Timing critical: apply at full bloom.
• Ethephon releases ethylene → aborts flower/fruit set.
• Hire ISA‑certified arborist with high‑reach sprayer.

Acorn crops vary yearly (frost at bloom reduces naturally).