An online resource based on the award-winning nature guide

Sawfly Cocoon

Sawflies are often mistaken for wasps, but there are subtle differences in appearance, including the thick “waist” of a sawfly compared to the threadlike waist of a wasp.  Their common name comes from the females’ sawlike ovipositor which they use to cut into plants and lay their eggs.  Certain species of sawflies overwinter as pupae inside cocoons that they attach lengthwise to twigs.  These cocoons are fairly small (the pictured cocoon is just over ¼” long).  Sawfly cocoons persist even after the adults emerge in the spring, as they are made of very tough material.   Look for capped cocoons during late fall and winter, and empty cocoons, sometimes with the cap still attached, the rest of the year.

One response

  1. Kay Shumway

    You are continuously. Amazing. I love learning about things that you see and I miss! Great picture as always!

    October 9, 2012 at 2:06 pm

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