Elm Tree

Question

Worms or larvae, about 1 inch long and white, are in the trunk and branches of my elm tree in Sedona, AZ.

Answer 1

Could be webworms. If so, they will build webs in the tree which are hard to break up for spraying. It can be done, however. See this link.
http://www.dailypuppy.com/articles/elm-tree-bag-worms/0212dfa5-e2ae-d475-a225-d1daefb10a3f