Rust on serviceberry? Yes. Has the whole world gone mad? No. It just reveals itself to each of us in manageable gulps. We talk frequently of three “cedar rusts” on BYGL: cedar apple rust, cedar hawthorn rust, cedar quince rust, all caused by separate species in the fungal genus Gymnosporangium (bygl.osu.edu/node/781). In fact, it is not as simple as this – there are over 40 species of the Gymnosporangium fungus.
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