Aug 28, Abnormal yellowing of leaf tissue is called chlorosis. Leaves lack the essential green pigment chlorophyll. Possible causes include poor drainage, damaged roots, compacted roots, high soil pH, and nutrient deficiencies in the plant according to James Schuster University of Illinois Extension horticulture educator. Aug 12, If trees are dropping their leaves in the heart of summer, it's a sign that something's wrong.
For a number of reasons, it’s not good that your street tree is dropping leaves. First, it makes a mess, but you already know that. Second, the tree is showing you that it is under stress, which is unhealthy for the tree and makes it more susceptible to insects and Estimated Reading Time: 4 mins.
The fungus Gnomonia leptostyla infects black walnut trees and produces circular, dark brown or black spots on leaves that enlarge until leaves turn.
Rhododendron: (Honorable Jean Montague) Some of the lower leaves are turning yellow and falling off. Is this normal for this time of year? Thank you. I am in Zone 8B, British Columbia. New York's official state tree is the Sugar Maple. In spring, it yields the sweetest sap for syrup and sugar, in summer, it's the perfect shade tree and in fall, it wears a heavy crown of yellow, orange and red leaves. Leaf: 5 taper-pointed lobes.