Rust on Rose Leaves
Rust is a fungal disease that seems to be more prevalent in West Coast gardens; it is rarely indicated east of the Rocky Mountains. Rust appears as its name implies, as red-orange spots (raised looking like warts) on undersides of leaves and yellow blotches on top surfaces. Long, narrow rust spots or streaks may also form on young canes. If left on roses, these spots will develop into large groupings of rust ‘warts’ and in autumn they will turn black. Ultimately this disease will cause the entire defoliation of the rose plant.
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