Thrips typically feed on leaf buds before they open, which results in leaf abortion or flower deformation. Numerous species of thrips feed on herbaceous perennials. Several thrips species transmit viruses, including impatiens necrotic spot and tomato spotted wilt virus.

Management: Remove weeds from adjacent areas – many weeds serve as a reservoir for thrips and the viruses they transmit. Placing yellow sticky cards among plants, just above the canopy, will trap adults. Thrips control with contact insecticides may be difficult because they tend to reside in unopened terminal and flower buds. Sprays need to be applied when plants are young.