Managing Aphid Honeydew on Large Landscape Trees

Sticky honeydew coating maples in July signals aphid infestation. These soft-bodied insects suck plant sap and excrete sugary waste that coats surfaces below. On large trees, foliar spraying is impractical, making systemic treatment the best option.

Systemic Solution for Mature Trees

Soil-applied imidacloprid (Bayer Advanced Garden Tree & Shrub Insect Control) moves through roots to leaves, killing aphids as they feed. Provides months of protection with single application.

Alternative Contact Sprays (for smaller trees)

• Acephate (Orthene)
• Bifenthrin (Talstar)
• Insecticidal soap or horticultural oil
• Rotate chemical classes if resistance suspected

Application Strategy

1. Confirm aphids present on leaf undersides
2. Apply systemic drench at tree's dripline
3. Water thoroughly to move product into root zone
4. Monitor for honeydew reduction within 2-3 weeks

Healthy trees tolerate moderate aphid populations. Focus treatment on high-value specimens or where honeydew creates nuisance on patios, vehicles, or walkways.