The appearance of your yard plays an integral role in the overall curb appeal of your property. Trees that are in poor health not only detract from the beauty of your yard, but can also cause widespread damage that can affect the look of your property for years to come. If you have sick-looking trees, contact a lawn care provider in the Pleasanton area for a tree disease diagnosis . Your treatment options depend on the type of disease and the extent of the damage. Some of the most common tree diseases in the Bay Area include: 
Anthracnose
Anthracnose is a group of tree diseases that cause dark, sunken lesions on leaves, stems, flowers, and fruits. Also known as leaf blight, anthracnose most noticeably attacks sycamore, ash, oak, and evergreen elm trees. Infections on deciduous plants and trees are more severe in areas where prolonged spring rains occur after new growth appears.
Crown Rot
Several species of soil-borne pathogens cause crown rot in herbaceous and woody plants and trees. Almost all fruit and nut trees, as well as most ornamental trees, can develop crown rot is the soil around the base of the tree remains wet for prolonged periods.
Aspen Canker
Canker disease can cause sunken oval areas on the bark in early stages, but can lead to widespread root and structural damage and areas of crumbling bark over time. In addition to aspen trees, the fungus that causes canker can also affect cottonwood, silver maple, spruce, mountain ash, birch, and willow trees.
Dutch Elm Disease
Dutch Elm Disease (DED) is one of the most destructive shade tree diseases in North America. DED mainly affects American elms, though other elm species are affecting to varying extents. This fungal disease causes yellow or brown foliage and dark brown or black streaks on the wood just under the bark.