Dealing with Woolly Aphids and Cold Damage on Camellias

Identifying the Problem

Two camellias in front of a home in Mississippi are showing a white, powdery substance on the undersides of leaves, and most of this year's blooms turned brown after an unusually cold winter. The powdery material wipes off easily with a cotton swab.

What Are Those White Specks?

The description matches woolly aphids—small insects that secrete a white, waxy coating for protection. To confirm, search “woolly aphids” in Google Images and compare with what you see on your plants.

Treatment Options

• Systemic insecticide: Products like Bayer Advanced Tree & Shrub Insecticide (blue bottle) contain imidacloprid. Applied as a soil drench, it moves up through the roots and protects the plant for several months.
• Contact sprays: For quicker knockdown, ask your local garden center about horticultural oils or insecticidal soaps labeled for aphids on camellias.

Always read and follow the label directions for mixing and application.

Cold Damage and Bloom Loss

The brown blooms are likely a result of the harsh winter. Camellia flower buds are sensitive to freezing temperatures, and a sudden cold snap can kill developing buds or cause them to drop. While you can’t undo this year’s damage, proper care—adequate water, mulch, and a balanced fertilizer in spring—will help the plants recover for next season.

Need a Second Opinion?

If you’re unsure after checking photos, feel free to send a clear, close-up picture of the affected leaves. Make sure the image is in focus before sending.