Harlequin Bug

Insect Identification

Images

Harlequin Bug

Damage

Most damage done by harlequin bugs are not easily detectable. Heavier infestations will result in deformed, brown, or dying leaves, small white bumps on the bottoms of the leaves, and possibly death of the plant. However, this is rare as you will be able to spot these bugs before they get to be a large problem.

Affected Plants

  • Cabbage family

Management

Control techniques are listed in order of effectiveness.

Row covers

  • If possible, completely cover affected plants early in the season and keep covered as long as bugs remain a threat.

Physical removal

  • Regularly check the underside of the leaves for both adults and the eggs. Crush them all with your fingers.

Insecticides

  • Insecticides should not be necessary with this pest unless the numbers are so great that it is too difficult to physically remove them all.  Even when insecticides are required, it is advisable to continue physically removing the insect.  Be sure to wear gloves when removing the insects after spraying.

Further Reading

  • New Mexico State University – Harlequin Bug
  • Overall, L.M. 2008. Evaluation of organic insecticides to control harlequin bug, Murgantia histrionica (Hahn), and yellowmargined leaf beetle Microtheca ochroloma Stål, on leafy greens [M.S. thesis]. Stillwater: Oklahoma State University.