Evaluation of bio-rational insecticides to manage chilli thrips, Scirtothrips dorsalis Hood (Thysanoptera: Thripidae) on roses

KnockOut® roses are among the most widely sold landscape ornamental plant in North America and chilli thrips, Scirtothrips dorsalis Hood (Thysanoptera: Thripidae) has become the most serious insect pest issue affecting the industry. Sole reliance on chemical controls is not the best option to controlling chilli thrips populations due to risks for developing resistance after frequent insecticide applications, negative impacts on non-targets beneficial insects, and other environmental concerns. We are testing alternative bio-rational insecticides including commercial entomopathogenic fungi (Beauveria bassiana and Metarhizium brunneum), botanical materials (azadirachtin), horticultural oils, and their rotations against chilli thrips. We are also developing a rapid sampling tool for growers. Results of first year of field experiments will be discussed in this oral presentation.