Rust (fungus)
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Rusts are fungal plant pathogens of the order Pucciniales causing plant fungal diseases.
Bruine roest op tarwe
Germinating urediniospore of Puccinia graminis, model from the late 19th century, Botanical Museum Greifswald
Rust hypha attacking stoma (1600x magnification)
Rust fungus on a leaf, under low magnification
Witch's broom
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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
Rust (fungus)
…the surfaces of affected plant parts. Some rust species form perennial systemic infections that may cause plant deformities such as growth retardation, witch's broom, stem canker, galls, or hypertrophy of affected plant parts. Rusts get their name because they are most commonly observed as deposits of powdery…
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