Northern corn rootworms are a major pest to corn plants. Both the larvae and adults can cause severe plant and root damage. The larvae are slender and yellowish white with dark heads. Adult northern corn rootworm beetles are pale or green in color depending on their age. Eggs overwinter in the soil and hatch in late spring/early summer. The larvae then feed on plant roots for about 4 to 6 weeks before pupating. Adults then emerge about a week later in mid to late summer. Northern corn rootworms typically have 1 generation per year.