Rose Chafer

The rose chafer is a scarab beetle in the subfamily Melolonthinae, closely related to May beetles and June bugs. Unlike many of its stouter, glossy relatives, it has a distinctly slim, gangly build covered in fine grayish-tan hairs.

It is native to eastern North America and is best known for its habit of congregating in large numbers on rose flowers just as they open in late spring and early summer, a behavior that gives the beetle its common name.

As a member of the scarab family, the rose chafer plays a dual ecological role: its root-feeding larvae live in the soil as part of the grub community, while adults, though feeding on garden plants, also incidentally move pollen between flowers as they visit blooms.

• Slender, elongated body (unusual for a scarab) covered in fine, pale grayish-tan or fawn-colored hairs.
• Long, spindly, reddish-brown legs that appear disproportionately long for the body.
• Head and pronotum slightly darker than the body; clubbed antennae typical of scarab beetles.
• Lookalikes: distinguished from Japanese beetles by its narrower, hairier, tan body versus the Japanese beetle's stouter, shiny metallic green-and-copper form.

Rose chafers are most common in areas with light, sandy, well-drained soils, which their larvae require for development. They range across the northeastern and midwestern United States and adjacent Canada, appearing in gardens, meadows, and along woodland edges. Adults emerge and are active for a few weeks in late spring to early summer, congregating wherever flowering plants are in bloom.

Adults are day-active and gather in dense feeding groups on flower blossoms, particularly roses, peonies, and grapevines, consuming petals and soft foliage tissue, often leaving a lacy, skeletonized appearance on leaves. Because they emerge and feed in synchronized swarms over a short window, their damage can appear suddenly and then subside as the adult flight period ends. Larvae, whitish C-shaped grubs, live underground feeding on the roots of grasses and other plants, contributing to the community of soil-dwelling grubs.

Rose chafers undergo complete metamorphosis with one generation per year. Adult females lay eggs in sandy soil during summer, and the hatching grubs feed on grass roots through late summer and fall before overwintering deeper in the soil as larvae. They resume feeding and pupate in spring, with adults emerging in late spring to begin the cycle again by feeding and mating on flowering plants.