The wet spring conditions this year have favored the development of anthracnose on shade trees. Symptoms of anthracnose have been observed on white oak, ash, sycamore, and maple. The distortion and browning of leaf tissue have created some concern for observant tree owners. Anthracnose fungi also can cause early loss of leaves.
The ISU bulletin PM 1280, Anthracnose of Shade Trees, is a good source of information. Immediate management practices on established shades trees are not necessary. Trees will show recovery as flushes of growth occur later in the spring.
Images of anthracnose symptoms can be found on the Plant Disease Clinic Web site. Click on Special Feature or Plant Diseases.
This article originally appeared in the 5/23/2003 issue.
Links to this article are strongly encouraged, and this article may be republished without further permission if published as written and if credit is given to the author, Horticulture and Home Pest News, and Iowa State University Extension and Outreach. If this article is to be used in any other manner, permission from the author is required. This article was originally published on May 23, 2003. The information contained within may not be the most current and accurate depending on when it is accessed.