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US: E-gro alert: How to control rust on Aster

One major foliar disease of Aster is rust, which is a generic name for a group of fungal pathogens (including Coleosporium campanulae and several Puccinia species). Rust appears as orange or brown bumps (or pustules) on the underside of leaves and potentially as chlorotic spots on the topside of the leaves (Figure 2). When the infection is sufficiently severe the leaves themselves may turn chlorotic and then necrotic. Since rust requires live plant material to complete its own lifecycle, it may not kill the plant, but can reduce plant growth to the point of losing all ornamental value.

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