I have noticed that many of the trees in my yard are
dropping leaves, some still green and others yellow. I have a sweet
gum, a linden and several black cherries. I imagine the very hot,
dry weather is to blame but want to be sure it is not some kind of
A. You are absolutely right that the weather is to blame. What
you are seeing is an environmental problem rather than a disease
problem. Diseases are usually species specific. It is unlikely that
the same disease would attack these unrelated trees. This has been a
rough growing season for woody ornamental plants.
The warm spell
in March forced many trees and shrubs to put out new growth much
earlier than normal, followed by frosts and freezes that damaged or
killed the tender new growth. As if that wasn't enough stress,
June was very dry and July started off with record high temperatures.