Problem: Beetles (Rosa (Rose))
Several different beetles infest roses. They may destroy the ornamental value of the plant by seriously damaging the flowers and foliage. The insects usually spend the winter as larvae in the soil or as adults in plant debris on the ground. In late spring or summer, mature beetles fly to roses and feed on the flowers, buds, and sometimes leaves. Punctured flower buds usually fail to open, and flowers that do open are often devoured. Many beetles feed at night, so their damage may be all that is noticed. Female beetles lay their eggs in the soil or in flowers in late summer or fall. The emerging larvae crawl down into the soil to spend the winter, or they mature and pass the winter as adults. The larvae of some beetles feed on plant roots before maturing in the fall or spring.
Apply an insecticide labeled for this pest, following label directions.