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Photo#435852
What kind of cocoon is this from my maple tree???

What kind of cocoon is this from my maple tree???
Canal Winchester, Fairfield County, Ohio, USA
August 1, 2010
Size: 3.5"
There were many, many of these in my maple tree. Most were attached to leaves and the leaves surrouning them were turning yellow or brown/dried. This particular one had a black, tubular casing dangling from it, which the others did not. Possibly unrelated, the same tree had a large tent filled with small black eggs.

Moved
Moved from ID Request.

Are these bagworm moths harmf
Are these bagworm moths harmful to the host tree? Should they be removed?

 
Yes.
They can cause defoliation and the female moth lays eggs inside the bag. If you leave them on they will likely multiply.

 
If there are enough of them
they can cause damage. Here's some more information from Ohio State.

Looks like
one of the Bagworm Moths (Psychidae):



You can read more about them here.

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