Now we know that witches’ broom isn’t caused by witches; it’s actually caused by stress that is brought on by pests, diseases — including anything from mites, aphids, nematodes to fungi ...

https://doi.org/10.2307/2435778 • https://www.jstor.org/stable/2435778 1. Witches' broom of White Flowering tobacco is a new disease transmitted through an inarch ...

The most common diseases that affect cedar trees are ... which is bunched and commonly referred to as witches' brooms. While most rusts won't kill your tree, it's advisable to cut out the infected ...