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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

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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.

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