Southern corn rootworm
- Adult: Bright yellow-green beetle with black head, legs and antennae and 12 black spots on the wings.
- Larvae: Yellowish white with a somewhat wrinkled body and brown legs.
- Eggs: Oval, dull yellow and about the size of a pinhead.
Timing of damage: VE to V9
Type of damage: Larvae chew grooves or tunnels into the roots, and sometimes tunnel into the base of the stalk. Stunted or dead plants result.
Scouting: Dig up 10 randomly chosen plants and check for rootworms by hand-sorting or washing the soil from the roots.
Economic threshold: For larvae, treat if two or more are found by hand-sorting or eight or more