Jap beetle 1 MER copy.jpg

Japanese beetle


  • Adult: Metallic green beetle with bronze wing covers, about ½" long. Six tufts of white hair on each side of the abdomen just below the wing covers.
  • Larvae: Grubs are creamy white with a brown head capsule, C-shaped and about 1" long.
  • Eggs: White to translucent, small and elliptical to spherical in shape.  

Timing of damage: VE to R8

Type of damage: Adults skeletonize leaves. Larvae feed on roots.

Scouting: Examine five plants in five locations to determine percentage of defoliation.

Economic threshold: In V stages: 40% defoliation. R1 to R5: 15% defoliation. R6 to harvest: 25% 
defoliation and beetles are actively feeding.

Similar Pests

Ask an Agronomist