June Beetle Location
June beetles, aka June bugs, daw bugs, May beetles, and white grubs, include about 200 species and are distributed throughout North America.
More than 200 species injure grasses and vegetables in the grub stage and trees as adults. Adult beetles eat leaves of oak, ash, birch, pine and other trees, as well as blackberry leaves. Grubs attack roots of corn, potatoes, soybeans and strawberries.
June Beetle Appearance and Habits
Most beetles have a three-year cycle. Large, dark-brown beetles and white, brown-headed grubs winter in the soil. In spring adults leave the soil at night, flying to feed on leaves, mating, and returning at dawn to lay round white eggs in grassland soil. The grubs hatch in two or three weeks and feed on roots until fall when they work their way below the plow-line for winter.
Working upwards the next spring, they do most of their damage this second season. They grow to about an inch long, being the largest grubs commonly found in soil. The third season they feed until late spring, pupate in soil, change to beetles in late summer, but do not leave the ground until the next spring. Heavy beetle flights are to be expected every third year, but since there are different broods at varying stages in the life cycle, some June beetles appear every spring.
How to Manage June Beetle
Rotate berries with deep-rooted clover and alfalfa.
Tear up infested lawn and grasses, treat with organic fertilizer, and till and plow deeply to destroy the grubs the summer before planting.
Handpick adult beetles.