In spring the female will lay up to 330 eggs on the ground. Once hatched, the larvae will burrow into the soil where they feed on the roots of plants. Larvae spend winter in the ground and emerge as adults in the spring.
Larvae spend winter in the ground and emerge as adults in the spring. Eggs are also laid individually within grains or seeds. The larvae will feed on the grain and pupate inside the husk emerging as an adult from the grain. This is where they are a pest in stored grains as they can continue to mate and lay more eggs. With each female laying 300 eggs it easy to see how quickly they can ruin the harvest.