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
Giant ichneumon wasps
Megarhyssa spp.
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.
