The bottom-left petal does show something. But again you have a strange sepal pattern. Co-incidence? Or are they reacting to your sprays somehow? I only ask because I know my double-knockout rosebush reacts to my anti-fungals in strange ways (I think that anti-fungal causes some chlorosis and delays flowering). Daylilies may also be quirky when full of chemicals. This I have zero experience of (just thinking out loud).
