Laboratory bioassays were used to evaluate the effects of severalcommon vegetable insecticide formulations on adult Chauliognathusmarginatus, commonly referred to as margined leatherwing beetles.Chauliognathus marginatus is a frequent visitor and possible pollinatorof several flowering vegetable plants in the eastern UnitedStates that may be exposed to insecticide formulations duringnormal activity. Treatments included Sivanto (flupyradifurone),Closer (sulfoxaflor), Admire Pro (imidacloprid), Assail (acetamiprid),Blackhawk (spinosad), and a water-only control (Table 1). On 10Jun, adult C. marginatus beetles and flower sprigs were collectedfrom wild hemlock (Conium maculatum) at Virginia Tech’s KentlandResearch Farm in Whitethorne, VA. Three 10-cm-long hemlocksprigs were dipped into 500 ml of an insecticide solution preparedat the per-acre field rate of formula, dried for approximately 30 minunder a fume hood, inserted into a cube of water-saturated floralfoam, and placed upright in a 475-ml deli cup. This was repeatedfor five replicates of each treatment. Nine beetles were confined ineach deli cup and held at laboratory ambient light and temperature.At 1 and 2 DAT, beetle mortality was determined by prodding eachinsect and observing for movement. Percentage mortality data wereanalyzed with ANOVA and means separated with Tukey’s HSD.
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