How do I get rid of bag worms?


I have a beautiful pine tree that is getting infested with, what I was told are bag worms. Looks like a cocoon hanging in different areas. Was told they will kill the tree. When we moved in here 30 + years ago there were nice pine type bushes alone the front. One by one they all died. I replaced them and those died. Never planted any others. Didn’t know what killed them but remember seeing those little bags hanging. I thought it was part of the plants. Been told they like fir/pine trees. No one here can tell me how to get rid of them. I need help.

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