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more than one host? Why such different hosts? What happens if the alternate host disappears?
It turns out not all rusts require multiple hosts. One of the most common single-host rusts we can see in the county is the May-apple rust, Puccinia podophylli. It forms frizzy, bright orange growths on the surface of May-apple leaves in the springtime. They make only one kind of spore that transmits the fungus from one May-apple to another without using an alternate host. Simplifying the life cycle seems sensible to us. Why don’t all rusts do this?
The slimy cedar balls we see now are only the most conspicuous of the thousands of plant and animal pathogens that erupt in the county each growing season. It’s a reminder that
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