Rhododendron whitefly
Dialeurodes chittendeni
132 host plants
Last updated
Small whiteflies (0.04-0.08 inch long) infest tender new leaves on rhododendrons, causing yellowing and leaf curling, particularly on branch tips. Whiteflies produce copious honeydew that develops into black sooty mold growth, creating an unsightly coating. Infested leaves often display white powdery residue and sooty mold accumulation on stems and foliage beneath.
This whitefly is primarily aesthetic; heavy infestations can damage susceptible plants but rarely cause serious health impacts. Reduce nitrogen and switch to slow-release fertilizers. Gently vacuum plants in early morning. Horticultural oil with thorough coverage provides low-toxicity control.
Quick Reference
Cultural Controls
- Do not overfertilize.
- Whitefly numbers increase with increasing foliar nitrogen levels.
- If necessary, switch to a slow-release fertilizer and/or one with less nitrogen.
- Lightly vacuum plants in the early morning to remove cold, slow-moving whiteflies.