I was delighted to find that spinosad is effective against thrips. But when does one spray it? Do thrips enter the buds? Or just the open flowers? Where do thrips come from? Will spinosad kill them before they destroy the flower?
Name: Toni Denver Metro (Zone 5a) Whiskey Tango Foxtrot.
I'm no help there.. I just use Bayer Rose Protection. I'm not very green I guess. LOL. I spray whenever I see roses that look half eaten or don't open fully.