Tar Spot is not actually “tar”, but rather a fungal disease that occurs in late summer due to certain combinations of weather patterns. During late summer, black tar-like spots are formed on the upper surface of leaves within the yellow spots. Tar spots may cause premature defoliation, but are not known to kill trees.

There isn’t any registered fungicide that can prevent or cure this disease, however raking and destroying fallen leaves will help manage the problem because the fungi overwinters on the leaves.

If you are concerned about the health of your trees, its best to get the advice of an expert arborist.  Contact us today at (248) 349-4636 if you have concerns or questions.

An arborist is an individual who is trained in the art and science of planting, care for, and maintaining trees.  ISA Arborist Certification is a non-governmental, voluntary process by which individuals can document their base of knowledge.  Certified arborists are individuals who have achieved a level of knowledge in the art and science of tree care through at least three years of experience and have passed a comprehensive examination developed by some of the leading experts in tree care.

How Do I Know if My Landscape Company Uses Certified Arborists?

Ask about membership in professional organizations such as the International Society of Arboriculture, the National Arborist Association, or the American Society of Consulting Arborists.