many of my orchids, all Hibiscus and one Plumeria are Thrip magnets. i go for the kill but they are tougher to beat back than spider mites !! i look back fondly on the days when white fly's were a menace. lesion and scrape like marks on the flowers, lip that is twisted and stuck on itself flower parts all S.N.A.F.U.ed i did not sign up to be a Thrip Farmer what has been used to beat them down - chemically ?