Globe Willow Dripping Sap: Aphid or Scale Infestation

Cause of "Rain" Under the Tree

The sticky, shiny leaves and rain-like dripping are honeydew excreted by sap-feeding insects—either aphids or soft scales. Both suck plant juices and secrete sugar-rich waste that coats surfaces and attracts bees/wasps.

Treatment Strategy by Season

Now (Late Summer/Early Fall)

Spray reachable foliage with Orthene (acephate) for quick knockdown. Systemic action helps, but coverage on large trees is difficult.

Next Spring (Best Long-Term Control)

Apply Bayer Advanced Tree & Shrub Insect Control (imidacloprid) as a soil drench at bud break. Roots distribute insecticide to new growth, providing season-long protection. Fall application is less effective as trees enter dormancy.

Product reference: Bayer Advanced Insect Control

Key Point

Control the sucking insects, and the honeydew (and associated sooty mold, ants, wasps) disappears. Treat early next spring for best results.