Japanese elm tree and leaves.

Feb 11, Step 1: Find the Fungus. Finding the fungus in the tree is the first step to saving elms by tracing. Step 2: Remove Diseased Branches. Prune off the diseased branch where it connects to the main trunk. Step 4: Post-Tracing Protection.

Feb 23, Trees will often set more leaves in the spring than they can support during the summer. Heat and drought stress will cause the tree to lose leaves that it cannot support with the available soil moisture. Leaves that drop are most often yellow with no discernible disease spots. Do elm trees lose their leaves? It certainly doesn't mean that the tree will always drop just half its leaves. Or, funnier, that 50% of trees will drop them all and 50% will drop none.

Mostly, it means that the tree will drop some of its leaves, the extent of which is determined by environmental factors. Semi-deciduous trees drop more leaves as the temperatures drop and more leaves as the water conditions drop. Behind it all, too, is the genetic factor.

Aug 31, It has been losing its leaves in August for the last 10 years. Leaves turn a dull green then they get brown splotches on them,then they turn a yellowish color, then they elm tree leaves dropping completely brown and then they fall. The tree will be completely bare in 10 days to 2 weeks. The tree looks great from April to the middle of August. May 04, “I’m no entomologist, but after some research, my best guess is Elm Leaf Beetle.

These guys feed on elms and drop to the ground in large numbers as little yellow guys to pupate. Sounds like the yellow-rumped Warblers are doing a good job of natural pest control.”Estimated Reading Time: 3 mins.