Tiny white-winged insects feed mainly on the undersides of leaves. Nonflying, scalelike larvae covered with white, waxy powder may also be present on the undersides of leaves. When the plant is touched, insects flutter rapidly around it. Leaves may be mottled and yellowing.
Remove heavily infested leaves. Vacuum plants to pick up adults. Apply an insecticide labeled for this pest, following label directions. Inspect new plants when you bring them home.