This member of the Ascomycetes is a fungus well known for many plant diseases, particularly to food plants. It is a scab fungus which overwinters in infected shoots and becomes active in the spring. Trees and ground cover are easily infected. Click here to see a picture of an infected pecan tree and here to see infected pecans. The pictures are in the archives of the Texas A & M Agricultural Station. The diagram below describes the general morphology of Microsphaera
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