Thrips are very secretive. If you can, hold a sheet of white printer paper under the buds and tap them as hard as you can without doing damage, see if any fall out onto the paper. It's easier if the scape is off the plant so you can tap it on the paper but I'm assuming you won't want to do that
Keep a look out for these other guys too:
http://www.daylilies.org/ahs_d...
