Roses fail to blossom or existing buds suddenly turn black and die. The foliage and the stem surrounding affected buds may also blacken and die. 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.