The clinic has had many complaints of browning of tree leaves in the past few weeks.
Symptoms vary from edge burn to necrotic spots to curling and twisting of leaves and even leaf drop.
There are several problems that might be involved. One possibility is leaf scorch, a noninfectious, environmental scorch that occurs each year when water cannot be translocated to the foliage as rapidly as it is lost. The causes vary and might include root injury, root rot, poor soil conditions, high winds, transplant shock, flooding, drought and so on. Symptoms of scorch include browning of the leaf margins as well as tissues between veins. If you have been inspecting trees regularly, you will notice that injury appears first on the newest, most tender growth, which still has thin cuticle tissues.