I get them on my daylilies from aphids. Maybe a thrip can cause the bloom to look like that and an aphid can too? I wash my daylilies. I started late this year, even though I started on time. I was about a month late because spring started early. I already had scapes and buds. I thought what a washout this year will be with my buds having bumps. Alot of my moonlit masquerade blooms looked bad, but they all bloomed perfect. Try to determine the pest. Aphids leave dandruff and thrips show up as... I had to leave blank because I have not had thrips. Treat the daylilies and I hope all your daylilies bloom beyond expectations because we all know there is joy in a flower.
