As adults, green June beetles feed on fruits such as apples, peaches, and figs. Usually, they prefer to eat overripe or decaying fruit. Occasionally, adult green June beetles feed excessively and cause economic damage to grapes and small fruits. Green June beetle females that eat fruit live longer and may lay twice as many eggs as those that don't eat fruit. Female beetles fly over the grass surface early in the morning and settle into the grass just after daybreak.
Male beetles fly during mid- to late morning.
Female beetles produce substances that attract the males to them. The female beetle constructs a walnut-sized ball of soil in which she lays 10 to 30 eggs. Each female may lay as many as 75 eggs during a 2-week period. Eggs hatch in about 2 weeks. Young grubs begin feeding on organic matter.