The effect of simulated solar radiation on western corn rootworm (Coleoptera : Chrysomelidae) adults fed D & C Red # 28, a photoactive xanthene dye

摘要

Western corn rootworm, Diabrotica virgifera virgifera LeConte, adults were fed a bitter Hawkesbury watermelon juice bait containing varying concentrations (0.00075-0.1%) of D & C Red # 28, a photoactive xanthene dye. Using a tabletop sunlight exposure system, the insects were irradiated at light intensities of 250-500 W/m(2). At 500 W/m(2) and 30 min exposure, a median lethal concentration (LC50) was obtained at a dye concentration of 0.00364%. At a dye concentration of 0.75%, the median lethal time (LT50) ranged from 24 min at 250 W/m(2), to 15 min at 500 W/m(2).