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University of Minnesota Extension

Extension > Garden > Diagnose a problem > What insect is this? > Trees and shrubs > Flies, moths, wasps,and other insects with obvious wings - 3/4 inch and longer > Giant ichneumon wasps

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Giant ichneumon wasps

Megarhyssa spp.

Giant ichneumon wasp

Winnifred Williams

Description: 1 1/2 inches long(not including the ovipositor). Long abdomen with very long tail-like ovipositor attached to it. Reddish-brown and yellow body or black with yellow head.

Where/When: Found on hardwood trees, especially birch, elm, maple and oak where they attack horntail larvae under the bark. Present May through July.

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