- Adult: Various species of beetle.
- Larvae: White or cream-colored grubs between ¼" and 1" long with brown heads. Usually curled into a "C" shape.
- Eggs: Varies with species.
Timing of damage: VE to V4
Type of damage: Grubs prune roots, so plants will appear stunted, wilted, discolored or could die.
Scouting: Dig up 1 cu. ft. of soil (2' long by 1' wide by 6" deep) in five randomly selected areas of the field. Sort through the soil to determine the number of grubs per cubic foot.
Economic threshold: Two or more live grubs per cubic foot. However, be careful to identify the species correctly, as that will affect how they should be managed.