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

University of Minnesota Extension

Extension > Garden > Diagnose a problem > What insect is this? > General/curiosity insects > Insects with obvious wings: greater than 1 inch long or wingspan is 2 inches or more > Giant ichneumon

Print Icon Email Icon Share Icon

Giant ichneumon

Megarhyssa macrurus (Ichneumonid wasp)

Aster leafhopper

Winnifred Williams

Aster leafhopper

Jim Occi, BugPics,

Size: 1 1/2 inches long

Description: Reddish brown with yellow and black coloring throughout (another species, M. atrata, is mostly black with a yellow head); has a 2-3 inch ovipositor.

Where/When: Associated with declining or recently dead hardwood trees between May and July.

Significance: Parasitizes horntails that are present in declining trees. It does not injure trees. Is not aggressive to people and ignores people when possible. If mishandled, it may use its ovipositor to protect itself.

More information on Giant ichneumon...

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