Witch's broom
Videos
Witch's broom or witches' broom is a deformity in a woody plant, typically a tree, where the natural structure of the plant is changed. A dense mass of shoots grows from a single point, with the resul
Witch's brooms on downy birch, caused by the fungus Taphrina betulina
Witch's broom on a white pine
Witch's broom in Yamaska National Park, Québec
Phytoplasma
Videos
Phytoplasmas are a group of Bacteria that are obligate intracellular parasites of plant phloem tissue and of the insect vectors that are involved in their plant-to-plant transmission. Phytoplasmas wer
Witch's broom
…the resulting structure resembling a broom or a bird's nest. It is sometimes caused by pathogens. Diseases with symptoms of witches' broom, caused by phytoplasmas or basidiomycetes, are economically important in a number of crop plants, including the cocoa tree Theobroma cacao, jujube (Ziziphus jujuba) and the…
Phyllody on Coneflower with aster yellows
A grape vine with "Candidatus bois noir" phytoplasma disease
A grape vine with "flavescence dorée" phytoplasma disease
Coconut palms dying of lethal yellowing disease