Both adults and grubs of the sugarbeet weevils can cause serious damage to beet crop. Adults of sugarbeet weevil voraciously feed on the leaves or clip off the leaves from young sugar beet seedlings. Also, they can cut the whole plant at the soil level and completely destroy the growing seedlings and young transplants. In contrast, all the larval stages of sugarbeet weevil will tunnel and feed internally on the roots of sugar beet that causes poor crop stand and severe yield losses.
The sugarbeet weevils overwinter as adults in the soil. When temperatures warm in the spring, mated females of sugarbeet weevils lay eggs in the soil at the base of plants. Eggs hatch within 5- 12 days into small grubs that burrow in the soil, tunnel into roots and start feeding internally. While feeding, larvae develop through 5 developing stages (instars) within three months. Mature larvae then pupate in the soil. Adult weevils emerge from pupae within 3 weeks. These adults then overwinter in the soil and life cycle continues.