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Mexican bean beetle

Description

  • Adult: Oval-shaped beetle that is yellow to orange-brown with eight black spots on each wing cover.
  • Larvae: Tiny, greenish-yellow, soft-bodied and spiny.
  • Eggs: Pale yellow to orange and laid in clusters on the undersides of bean leaves. 
     

Timing of damage: V1 to R7

Type of damage: Both larvae and adults skeletonize bean leaves. Adults will also feed on pods.

Scouting: Examine five plants in five areas of the field to determine percentage of defoliation.

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

Crop
Soybeans
Age
Adult
Color of markings
Black
Timing of damage
VE-VC
V2-V5
R1-R2
R3-R4
R5-R6
R7-R8
Insect color
Orange or Yellow
Insect markings
Spots
Insect type
Beetle or Weevil
Insect length
Less than 1/2"
Type of damage to crop
Leaf defoliation
Seed or pod damage
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