Looking up into a Hackberry Tree (Celtis occidentalis) you might notice a branch with an unusually dense cluster of twigs. These are known as Witches' Brooms. Their exact cause is unknown, perhaps some injury or stress to the tree. Associated with the Witches' Broom formations are two organisms, an Eriophyid Mite, Eriophyes celtis and a Powdery Mildew, Podosphaera phytoptophila.
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