Home » Volume 14 / 2010 » Issue 2 »
Novaluron as an Ovicide for Bollworm on Cotton: Deposition and Efficacy of Field-Scale Aerial Applications
Daniel E. Martin, Juan D. Lopez, Jr., Yubin Lan, Bradley K. Fritz, W. Clint Hoffmann, and Sara E. Duke
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Novaluron, Diamond® 0.83 EC, was evaluated for deposition on cotton and ovicidal efficacy against bollworm, Helicoverpa zea (Boddie), due to the increasing need to use insecticides with modes of action different than synthetic pyrethroids. Rotary atomizers and conventional hydraulic nozzles were used to aerially apply Novaluron at two spray rates, with and without the addition of spray adjuvants. Additionally, aerially applied treatments of methomyl, Lannate® LV, were applied with conventional hydraulic nozzles at the lower spray rate. Treated plots were compared to each other as well as an untreated check. All treatment applications were selected to deliver the applied spray at a volume median diameter of 175 μm. Ovicidal efficacy was determined by collecting eggs from treated plots at 0, 1, and 5 days after treatment (DAT). Results indicated greater deposition from higher spray rate applications as well as lower rate application with the addition of the selected adjuvant. Overall, rotary atomizer treatments and conventional flat-fan treatments at a higher application rate, and the lower application rate with the selected adjuvant resulted in increased control. Novaluron showed greater long-term control than methomyl.