Dutch elm disease
we had a large branch break off of an american elm tree about two weeks and have had a difficult time finding someone to cut it down and are wondering if the open wound on the tree is more susceptible to dutch elm and if there is anything we can do in the meantime to help protect the tree
Wright County Minnesota
The broken branch should be cut to the collar as soon as possible, but if the remaining part is still alive it won't attract the beetle that carries the dutch elm fungus. See https://www.extension.umn.edu/garden/yard-garden/trees-shrubs/dutch-elm-disease/ for more information. Instructions for correct pruning can be seen at http://www.extension.umn.edu/garden/yard-garden/trees-shrubs/pruning-trees-shrubs/.
Good luck with your tree.