Microstoma, also known as downy and white leaf spot is a hemlock tree fungus causing varying sizes of yellow spots on the top of the pine needles. The undersides of the needles have white, powdery spots. This disease occurs from the Microstoma juglandis fungus. If the disease becomes too severe, the ends of the branches form short clusters of shoots with undersized needles, known as witch’s brooms.
This tree is not poisonous.