Problem: Privet Rust Mite and Privet Mite
Aculus ligustri and Brevipalpus obovatus Both of these mites are extremely small and generally cannot be seen without magnification. They cause damage by sucking sap from the leaf tissue. They feed on the undersides of leaves. As a result of their feeding, the leaf cups or curls under and often drops from the plant. The privet rust mite may feed only on the cells in the surface of the leaf, causing a bronze russeting or browning. The green leaf pigment is unaffected. Or it may feed deeper in the tissue, resulting in leaf yellowing caused by the disappearance of chlorophyll. Some types of privet drop their leaves before discoloration develops. The rust mite is most prolific during cool weather. It feeds and reproduces primarily during spring and fall. The privet mite is usually active throughout the growing season. By midsummer it may build up to tremendous numbers.
Apply an insecticide labeled for scales, following label directions.