D3423: Efficacy of insect netting for reducing Synanthedon myopaeformis infestation in Okanagan apple orchards

Apple clearwing moth (ACM) (Synanthedon myopaeformis) is an invasive Sesiidae moth established in the apple growing regions of the Similkameen and Okanagan Valleys, British Columbia. Increasing incidence of infestation and a growing range have underscored the need for more management options for growers. During the 2020, 2021, and 2022 growing seasons, we evaluated the efficacy of 1/6″ square mesh polypropylene insect netting for management of ACM on apple trees. No effect was detected after one season, adding to evidence of a two-year life cycle in British Columbia. A reduction to 0% infestation with netting application was observed in a second season of use. We discuss the efficacy of netting over three seasons, as well as investigate potential unintended effects on fruit quality and related orchard management.