We have an arbor vitus in full sun all day and just in the past two days we...
We have an arbor vitus in full sun all day and just in the past two days we have had some type of bag worm attack the front of it. I am attaching a picture of what the bags look like. Can you please advise what the best way is to get rid of/kill the worms so it doesn't kill the tree? Thanks.
Your arborvitae does indeed had a very destructive pest called bagworm. See the following link for additional information, http://plantdiagnostics.umd.edu/level3.cfm?causeID=93
At this point in time you will have to spray the tree. You should use an insecticide with the active ingredient spinosad. It is found in a couple of products on the market. You should look for it in a garden center, plant nursery or farm supply store for it.
In the fall, winter or spring if you should see any of these sacs on the tree, pull them off and dispose of them.