Aspen Aphids in Fall: Don't Spray Now

Colorado aspens with aphids; tree service recommends 3 sprays in late September. Hard freeze coming, leaves will drop.

Advice

Waste of money. Aphids die with freeze; leaves fall. Spring spray (if needed) is appropriate. Tall trees = poor spray coverage = poor control.

Better Approach

• Get second opinion from non-sales source (county extension).
• Systemic imidacloprid in spring if chronic.
• Natural enemies often regulate aphids.