Skip to Main navigation Skip to Left navigation Skip to Main content Skip to Footer

University of Minnesota Extension
We're looking for your feedback on the Extension website. Please take our survey.

Extension > Garden > Diagnose a problem > What insect is this? > Garden Pests > Flies, moths, wasps,and other insects with obvious wings - 3/4 inch and larger > Iris borer

Print Icon Email Icon Share Icon

Iris borer

Macronoctua onusta

Iris borer

Jeff Hahn, University of Minnesota

Size: 3/4 - 1 inch long (wingspan up to 2 inches long)

Where/When: Is associated with iris; can also be found at attracted to lights. Active August and September.

Significance: Larvae damage iris by tunneling through the leaves and eventually damaging the rhizomes which can kill iris plants. Feeding damage can allow the entry of a bacterial soft rot which can be very damaging to iris plants.

More information on Iris borer...

Did this tool help you identify the insect? Tell us.
  • © Regents of the University of Minnesota. All rights reserved.
  • The University of Minnesota is an equal opportunity educator and employer. Privacy