By Dr Ananya Mandal, MD. Dopamine is a neurotransmitter released by the brain that plays a number of roles in humans and other animals. Some of its notable functions are in: 1  movement. 2  memory. 3  pleasurable reward.
Sycamores (Platanus spp.) are tall, spreading shade trees. These North American natives have few problems or pests, but their older bark flakes off in patches. If your sycamore is shedding bark, it may be a healthy, maturing tree.
An anthracnose infection causes young sycamore leaves to wilt and die. Because it's a deciduous tree, it's natural for your sycamore to drop its leaves each fall. However, if your tree's leaves are wilting and falling off soon after they emerge in spring, this is a sign of trouble. Sycamore species such as American sycamore (Plantanus occidentalis) and California sycamore (P. racemosa) are highly susceptible to the anthracnose fungus.