MAPLE                        ANTHRACNOSE Anthracnose is a fungal disease that occurs mainly on the lower leaves, but does not cause serious harm to the tree.

Symptoms: Light tan to dark brown leaf spots that vary in size and shape. Photo by Department of Plant Pathology

Symptoms: Randomly scattered lesions occur most frequently in the lower canopy. Photo by Chad J. Behrendt

General Information

Causal organism:	Kabatiella apocrypta
Over wintering:	In plant material and debris
Months of infection:	Unknown (suspect April-August) (most susceptible April-May)
Method of dispersal:	Rain and wind
Infection point:	Leaves

Control Measures

Control:	Sanitation (rake all leaves in the fall), prune and remove dead or dying branches, and properly water, fertilize, and mulch tree. Fungicides are not usually recommended.
Labelled fungicides: (First Application)	Thiophanate-methyl (Cleary's 3336) Copper or Bordeaux Mixture (April or May)
Comments:	This disease is common throughout Minnesota and is most severe during cool, moist springs.

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Plant Disease Diagnostics
University of Minnesota, Yard and Garden Clinic
Developed (1999) and maintained by
Chad J. Behrendt, Ph.D. and Crystal M. Floyd

For plant disease questions contact the Yard and Garden Line Content Last Updated 09/07/00 View University of Minnesota Disclaimer