Impacts of field-aged insecticide residues on the generalist predator Deraeocoris brevis (Hemiptera: Miridae)

A field-laboratory bioassay was initiated to investigate the lethal and sublethal effects of field-aged residues of two reduced-risk insecticides chlorantraniliprole (Altacor)  and spinetoram (Delegate) and an organophosphate-replacement insecticide lambda-cyhalothrin (Warrier II) on the generalist predator Deraeocoris brevis (Uhler) (Hemiptera: Miridae). Pear trees were sprayed with formulated pesticides using an air blast sprayer at concentrations equivalent to the high label rate dissolved in 100 gallons of water per acre.  Pear leaves with field-aged residues were collected at 1, 7, 14 and 21 days after treatment and exposed second instar and adult male and female D. brevis to evaluate lethal and sub lethal effects. Results will be presented.