The larvae feed in clusters at the bases of rosebuds. Prune off and destroy all infested plant parts. Spray plants with an secticide and apply a systemic insecticide to the ground around the plants where the larvae pupate. Holes appear in flowers and then in leaves. Light-colored flowers are especially susceptible.
Beetles move from flower to flower, consuming the petals before they eat the leaves.
They seem to be attracted to light-colored blooms. Pick beetles off plants by hand and destroy them. Spray the plants with an insecticide. In late summer and in spring, treat the ground around affected roses with a grub-controlling insecticide or with milky spore. Leaves become dry and have a full bronze sheen.