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Common signs that a tree is rotting include dead branches, a leaning trunk, peeling or cracked bark, leaf discoloration, and the presence of fungi. If you notice any of these signs, it’s best to hire an arborist near you to inspect your tree and determine if it can be saved or if it needs to come down.

Generally, avoid trimming trees in the summer (with the exception of pruning fruit trees as needed). Trees use a lot of energy in the summer, most of which is relegated to new growth. If you chop it too early, you could stunt the next season's growth. Again, when in doubt, do some research based on the specific tree type.

The best way is to start controlling tree height long before it grows too large, via careful pruning through the years. But that’s not always possible. If a tree has become too high or too large, use selective pruning to remove the most troublesome branches, one by one, without topping the tree. Gently shaping a tree like this can, over time, correct problems. You can also find growth inhibitors to spray on a tree to stop it from growing too rapidly, but use these sparingly if at all.

It’s not as common for Dutch elm disease to affect other types of trees, especially if the surrounding trees aren’t elms. However, it is possible for DED to spread to other trees, particularly in northern states, like Minnesota. In fact, it’s a good idea to use geography to identify wood and determine which types of trees are in your yard. 

Unfortunately, the complex and shallow root system of elm trees makes surrounding elm trees particularly vulnerable to DED. Early discovery is key!