sooby said:There are multiple species of rust fungi, something like 7,000, but, there is only one species that affects daylilies - Puccinia hemerocallidis. However there is more than one strain of Puccinia hemerocallidis in circulation and a given daylily cultivar may be more resistant or susceptible to each of the different strains. So yes, resistance or not of a cultivar may depend on which strain or strains one has in a garden.
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