Aphids feeding on Rosa Robusta . The larval stage of ladybugs, called lions, are feeding on the aphids. Mites Mites are also common on roses, but are difficult to see because of their very small size. They pierce foliage and suck plant sap from leaves. The yellowing and mottling of leaves that result are often the first symptoms observed.
Mites also form fine webs on the undersides of leaves where they feed.
Severe infestation causes defoliation. Mites are most often seen under dry conditions. Cultural practices that result in vigorously growing roses are a gardener s best defense against mites. Pesticides are commonly used to eliminate severe infestations. Dormant oil, which smothers mite eggs, is often applied to dormant bushes.