southern rootworm soybean MER copy.jpg

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 
by washing.

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