D3124: Comparing the efficacy of mating disruption techniques on diamondback moth in Virginia

One of the most particularly challenging pest of brassica crops in the United States is the diamondback moth, Plutella xylostella (L.) (Lepidoptera: Plutellidae). P. xylostella management is problematic due to the development of insecticide resistance to commonly-used spray regimes. Mating disruption is an important integrated pest management tactic that provides an alternative to ineffective insecticide applications and inhibits reproduction. A synthetic sex pheromone of the target pest is released at a high rate to reduce the chance of males finding females to mate. Diamondback moth sex pheromone has been identified and is available in many forms. Experimental field trials were conducted from June to September in Hillsville, Virginia, where we compared the efficacy of four different mating disruption technologies (+ control). Experimental plots were set up as separate fields of Brassica oleracea, ranging from 5-35 acres. Plots were divided by treatment, with each having three replicates. Treatments include: pheromone tablets (two rates), sprayable (0.5L/acre), and physical release dispensers (4/acre). After application, three pheromone-baited traps were placed in the center of each plot to monitor adult activity. Plots were sampled weekly for larval presence, adult captures, and damage severity. Previous work suggests adult captures and damage severity will be significantly reduced in pheromone-treated plots. Experimental results will be presented in November at the national meeting in Phoenix, Arizona. This study aims to reduce the overreliance of insecticidal applications and aid growers in managing diamondback moth populations.