Question
I have several fruit and nut trees here in TN and on my land in MS.  The problem that I am having is that some type of insect or bird is making holes in the tree bark in a perfect round circle around the tree  about every 8 to 10 inches.  Also I have been gretting a good crop of bag worms.  Can you tell me what to do to rid my trees of these hole bores and bag worms.

Also this might be out of your expertise, but I couldn't find any other expert for this question.  This is really 2 questions: 1.I am a Ham Radio Operator and want to build me a tower support using non treated 2 x 6.  I had planned on using Thom,Thompson water seal and the wrapping the lumber air tight in fiberglass cloth and brushing a good heady coat of Resin.  Do you think that the lumber would rot in a year or two or would I get more than 5 years before it would need replacing.  I do not plan for the wrap fiberglass would to make any contact with the ground.
2.On my land and home in MS I am building a 6 to 10 acre lake and want to build a large pavilion for club meetings and so on. I want to use some of the tall Pine trees as the supports. I am planning on removing the bark and then giving the pole or post a good coat of Thompson water seal and then putting an heavy coat of shellac or polyurethane coating on the post. In a wide ballpark figure just how crazy am I or would this work.  I have seen Pint tree post used for this in several Federal parks and it looks it has been there for ever with no rot and any wreaking.
Thank you for any insite you can give me on this.
P.S The reason I am using untreated lumber I have a excellent supply of 2 x 6 and 2 x 12 at 10 and 12ft long at no cost to me.  I am about to get over run with lumber and had better start building. A friend was over this past winter and told me that I was crazy for cutting up 2x6 and 2x 10 to burn in my wood heater in the garage. I let him keep on thing I was crazy and didn't tell him about my supply of lumber. I made that mistake once and Had friends calling me for free lumber. I am not going through that again.
Thank you again
jerry

Answer
The holes are from a bird. Sounds like sap sucker damage. These are wood pecker type birds that make the holes and when insects come to eat the sap in the holes the birds return to eat the insects. They will not harm the tree. The best way to rid the tree of sap suckers is to spray the trunk where the holes are with and insecticide this will prevent the insects from coming and the birds will go away. You can use any common insecticide--malathion, sevin or ready mixed home defense sprays. The tree will heal over the wounds without any further help.

Bagworms--There is an insect called bagworms but these are small sack looking growths that the insect lives in. I think what you are talking about is called fall web worms or eastern tent caterpillar--these are common in pecans and or plum or fruit trees. Fall web worms are in the late summer or fall and are on the outer part of the branches. The Eastern tent caterpillar are in the early spring and are nearer the trunk of the tree. Both can defoliate the tree. Here is a web link to information on ETC and its control. http://www.ca.uky.edu/entomology/entfacts/ef423.asp

Fall webworm information
http://www.entomology.cornell.edu/public/IthacaCampus/ExtOutreach/DiagnosticLab/...

Lumber questions
1. IF the wood does not touch the ground you should be able to get by with 5 years without the wood either decaying or being eaten by termites. There are wood preservatives that can be painted on the wood to hold the wood longer.
2. By no means use a a dead pine tree as a pole. The tree will decay within two or three years and break from wind. The poles used at ball parks are cut trees that have been pressure teated with a preservative. Using a tree still attached to the root system will not be a good idea.  

I hope this answers most of your questions.