Redbud Whitefly Infestation: Insecticide Schedule and Systemic Options

Threat Level

Heavy whitefly on 18-month redbud (half canopy yellow) = serious weakening. Honeydew → sooty mold → photosynthesis loss. Tree can die if unchecked.

Contact Spray Protocol

• 3 applications, 7 days apart.
• Cover both leaf sides thoroughly.
• Choices: Acephate (Orthene/Isotox), Malathion, Permethrin, Bifenthrin.

Systemic Options (Better)

• Imidacloprid (Merit/Bayer Advanced): Soil drench at root zone. Uptake → kills feeding whiteflies. Professional standard.
• Disyston (granules): Older, more toxic, restricted.

Recommendation

Imidacloprid drench now. Fastest, most thorough, least harmful to beneficials (soil-applied). Follow label exactly.

Young redbud is worth saving. Systemic treatment gives it the best chance.