Leaf Spot Diseases of Poplar
Crystal Floyd
Marssonina and Septoria leaf spots are two common diseases occurring on poplars, aspens, and cottonwoods. These diseases produce similar symptoms and have similar life cycles, but are caused by different fungi. Marssonina leaf spot is caused by several species of Marssonina, and Septoria leaf spot by Septoria musiva. Since these two diseases produce similar symptoms that may vary depending on the host and the severity of infection, a microscopic examination is needed to differentiate these two organisms.
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