We have the worst bagworm infestation I have ever seen

From: momopom
Sent: Thu, July 7, 2011 7:17:03 PM
Subject: bagworm infestation 2011

We have the worst bagworm infestation I have ever seen. Usually I remove the cocoons from the trees one at a time, but this year there seem to be many hundreds everywhere – even the blueberry bushes and privet are covered and there are cocoons hanging on light fixtures and gates. One large tree is
completely dead and I am concerned that I am going to lose more major landscaping plants.

I bought Sevin spray, but now think that might be a bad idea because it would kill other insects and perhaps even affect the birds.

Any information and/or suggestions would be welcomed.