Rose rosette disease
Rose rosette disease is a viral disease transmitted by eriophyid mites, causing characteristic symptom called witches broom - the plant grows deformed stems, leaves, and flowers. Other symptoms include thick or elongated stems with red color, flower buds in small clusters (rosettes), and stunted or yellow leaves.
Signs of damage:
The earliest symptoms of rose rosette disease include a red pigmentation of the underside of leaf veins followed by sharply increased growth of vegetative shoots, which are typically more succulent than normal and colored in various shades of red. Leaves often become deformed, crinkled, and brittle with yellow mosaics and red pigmentation. As the disease progresses, leaves become very small, petioles are shortened, and most lateral buds grow, producing short, intensely red shoots. The disease causes the plant to be exceptionally susceptible to freeze damage. Symptoms on cultivated roses are typically less severe than on multiflora rose. Cultivated roses show symptoms of thickened, succulent stems and a proliferation of thorns. Symptoms can mimic some forms of herbicide damage.
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