You said your "new" daylilies were mottled. Does that mean these are the first blooms ever to open on those plants or some of the first blooms? If so it may not be insect damage at all. I do think cool weather plays a large role, rain and other types of moisture also aid in causing it. I have had several new plants open this year that were so mottled I could not tell what they were. I still have a few that have already bloomed through the first scapes and I never could recognize them they were so mottled. Normally, though after a bloom or two they settle in and look like they should. If not then you may have an insect problem. Some daylilies look almost perfect from the first bloom, but most don't.
