Park Forest, IL--(ENEWSPF)--August 27, 2016. Large, unsightly, black spots on maple trees have become quite noticeable in Park Forest during the past several weeks. Park Forest's Recreation and Parks Department has received many calls from residents inquiring about them.
Village Arborist Todd Cann says this is a common condition called tar spot and is actually a fungal disease caused by fungi in the genus Rhytisma. It is particularly prevalent this year because of environmental conditions that have favored the spread of this disease.
Symptoms first appear in late spring or early summer as infected leaves develop light . . .