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Walnut Anthracnose (fungus)

Walnut Anthracnose (fungus)
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It is caused by a fungus, Gnomonia leptostyla, The disease may quickly spread during wet weather in the growing season and cause many walnut trees to lose nearly all their leaves by late July or early August. This premature defoliation slows the trees' growth and weakens them. Where premature defoliation occurs year after year, the stressed trees may die.