By Nathaniel Walton, Michigan State University Extension
Updated from an original article written by Diane Brown and Lori Imboden
Irregularly shaped anthracnose lesions on a red maple (Acer rubrum) leaf. Photo by Rebecca Finneran, MSU Extension.
Each year, Michigan State University Extension receives questions from the public regarding spots on the leaves of their favorite maple trees. Both anthracnose and maple leaf blister can be the cause of late spring and early summer damage to leaves of these popular landscape trees. Continue reading “Maple Leaf Blister And Anthracnose: Two Diseases Of Maple Leaves”
See below for information on training topics and events, including the WAA Summer Conference, leadership, pollinator habitats, safety, tree ID and the ISA Annual Conference. 
Over the years, a growing body of research has proven that regular access to trees makes us happier and healthier. They restore our sense of calm from head to toe — improving memory and attention span, enhancing cognitive functioning, lowering blood pressure and reducing cortisol levels. 
With recent storms passing through Wisconsin, communities may still be working on clean-up. Depending on the intensity of the storms and the condition of the trees, damage from high winds, heavy rainfall, hail and lightning can be quite severe. Cracked or broken branches, trunk damage and root failure are some of the main concerns, but also the risk and liability of damage to people and property.
The American National Standards Institute (ANSI) Z133, more affectionately known at “The Z”, is the standard that contains arboriculture safety requirements for pruning, repairing, maintaining and removing trees, cutting brush and using equipment in such operations. If you’re reading this newsletter, you, your staff or your contactors likely participate in work that falls under the purview of this standard. 
* These training opportunities are provided as an information service only and do not constitute endorsement by the Wisconsin Department of Natural Resources (DNR).
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The Wisconsin Arborist Association (WAA) is accepting