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Rose chafer beetles

Roses, peonies, raspberries, grapes, fruit trees, and many other cultivated trees and shrubs can have their leaves and flowers skeletonized or destroyed by rose chafer beetles. These tan beetles have reddish brown heads and orange or dark brown slender legs. Chafers live only about three weeks, but large numbers of these mating beetles were observed in central Minnesota during the third week in June on roses and peonies. Eggs are deposited just below the soil surface in grass, alfalfa, or clover sod growing on sandy, well-drained areas. They appear to become more common in areas of sandy, dry soils during drought periods. The larval stages (grubs) feed on roots of grasses and other plants until next June when they change into beetles, crawl out of the soil, disperse by flight, and congregate in great numbers in June due to the pheromones that the female beetles emit. Rose chafers have few natural enemies but can be readily controlled by use of contact or systemic insecticides. Apply carbaryl when adults first appear and repeat as labeled to control the adults.