We have encountered a number of Swedish Columnar Aspens in decline and have provided a link to some information regarding Bronze Leaf Disease. We are happy to provide a consultation and assessment of your trees. 

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Maple and Birch trees should be pruned mid-summer, typically in July throughout August. This is to minimize the loss of sap at the opening of a pruning cut and to allow the energy from the root system to reach the leaves.

If you have an irrigation system that does not have a rain sensor, be sure to make proper adjustments to compensate for the rain fall. If you have hard packed or high clay content soil, Waterlogging can be a problem for your tree's root systems.