Bag Worms my first guess. Take a sample to your local nurseryman and have him sell you an insecticide.

Make sure you have a way to applicate. Hose end sprayer, pump sprayer. If not have him recommend something. Keep it simple and low in price. Don't let them sell you the farm.

Dave

If it's bag worms, pull them off. It's free, safer for you and the plant, and very effective! A five footer should take you hardly any time. Make sure you destroy/smash them so they don't crawl out of their cocoons and onto something else.

That's fine. You can pull them off and many choose to do that.

Just remember if you miss just one. Easy to do. That's next years crop of bag worms all over again as the fertilized eggs over winter in the bag.

Dave