Hi Regina,
I have got them on trees only. Here are two options in controlling them.I have only tried hand picking.
Cultural Control-Mechanical Hand Picking. If the bags are few in number and easily reached they may be picked off the plant and squashed. This can be done easily in the late fall when deciduous foliage has been dropped or the bits of plant material on the bags turn brown and can be easily located on evergreens. Be sure to cut the attachment silk band so that the branch will not be girdled in the future.

Option 2-Biological Control-Use the Bacterial Spray Bt The bacterium, Bacillus thuringiensis (Bt), is effective against bagworms if it is used against young larvae. Applications should be made at the end of June after all the eggs have hatched and the larvae are through ballooning.
By the way the plants you sent me all survived and are growing. I'm so exited.
I hope the plants I sent you are doing well.
It has rained here allot today. Still raining heavy.Everything is getting a good soak.
Happy gardening,
Felix

Thanks Felix, your plants are doing fine too. I have to move the Amaryllis, I think it's in a too sunny location.

I guess I will have to go and bag the bagworms! I've only seen them on the screens and shed, but they must be on some of the plants, I just can't seen them there.

Send some rain down South!

Regina