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. Infected foliage must be disposed of immediately, as the fungus can survive on the plant if left lying on the ground. The early, large-flowering varieties are most prone to attack, with smaller-flowering species (eg, C. montana) being the most resistant

to the same plant. It's only a significant problem when young plants are being defoliated or you're growing specimens for a show. Bees snip out elliptical sections of leaf margins, particularly on roses, and use them to make thimble-shaped cells in their nests