Woolly Oak Aphids: The Source of White Fuzz Under Oaks

Those White “Seeds” Are Aphid Waste

The pea-sized, fuzzy white particles raining from your red oaks in September are waxy secretions from woolly oak aphids. You’ll likely feel sticky honeydew on leaves below. The aphids won’t kill the tree but may cause premature leaf drop.

Treatment Timing Is Critical

• Too late for this year. Trees are shutting down for winter; systemic insecticides won’t translocate.
• Apply next spring: Use Bayer Advanced Tree and Shrub Insect Control as a soil drench. Roots carry it to foliage, killing aphids as they feed. One application lasts the season.

Check local nurseries for the product. Your oaks will be fine—this is a nuisance, not a threat.