 Their eggs are laid in sandy soils, deep, and hatch in 1–3 weeks.This new generation of larvae will feed on the roots of grasses, weeds, and some ornamental garden plants during the rest of the summer, before they burrow deep in the soil to overwinter; these larvae will emerge as adults in the following year.After adult rose chafers emerge in late May to mid-June, they aggregate on leaves, buds, flowers, and fruit, in order to feed and mate.