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I wouldn't recommend mulching a plant with diseased leaves that come from it. But, it's okay to mulch it with a different plant's leaves. For example, you can use tree leaves around your roses or vegetables with no problem. We've found that even with a specific disease like powdery mildew, the strain that gets on a crape myrtle is not the same strain that afflicts a rose or perennial. So you can go ahead and use those leaves as mulch.
You can compost all the leaves together with no worry, and use the compost on all your plants. What ever you decide to do, don't let a leaf leave your property! Mulching will really save you time on weeding, plus they return valuable nutrients to the soil.