That link you said didn't work takes a long time to load.* It's in pdf format.* Your computer may not be set to receive pdf format.* It was a site that showed how to paint your tree.* You can also make a tube of fiberglass or aluminum window screen and secure it around the tree.* Leave a couple of inches between the tube of screening and the trunk of the tree for air circulation.* You will have to copy and paste this link as it is not clickable.
I found an environmentally friendly site for control of the stink bug you found.
Hope that helps.
When weeding, the best way to make sure you are removing a weed and not a valuable plant is to pull on it. If it comes out of the ground easily, it is a valuable plant.