Soil applied insectides at planting can be effective at controlling western corn rootworm. Seed treatments can also provide control for low to moderate infestations. Always read and follow all label instructions.
Many Bt traits provide protection against northern corn rootworm.
Because northern corn rootworms can only complete their lifecycle on corn (and related grasses), crop rotation was once an effective control technique. However, some morthern corn rootworms eggs now bypass this technique by remaining in the soil for two years before hatching (and thus skipping the year in which the field is rotated away from corn). Nonetheless, fields with high adult pressure one year will likely have high larval pressure the following year and so rotating away from corn in these fields remains a good management strategy.