Monarda/fungicide Question

Monarda/fungicide Question

I of course don't have a picture, but some of my monarda has gotten what appears to be a white dusting of well, dust on its leaves. Overall, the plants don't seem to be as robust as when they were first planted, and I think the problem is fungus. I have bought a sulphur-based fungicide. Is there any chance that anyone knows whether or not this is bee safe? I just think it would be awful to put a bee-toxic spray on a plant that attracts bees. I've seen conflicting opinions online, and I was wondering if anyone here knew definitively. Alternatively, other than increasing sun, does anyone know any bee safe/organic methods to knock out fungus? Thanks!
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