Sugarbeet grower surveys were conducted annually from 1982-2001 to determine insecticide usage on sugarbeet (Beta vulgaris) in North Dakota and Minnesota. The major insect pest of sugarbeet was the Sugarbeet Root Maggot, Tetanops mypopaeformis von Roder (Diptera: Otitidae). Maggots caused damage by their rasping feeding on roots and can result in losses of 40% of yield. Other insect pests of sugarbeet include wireworms, cutworms, and Lygus bugs. The organophosphate insecticides Counter 15G and Counter 20CR (Terbufos), and Lorsban 15G and Lorsban 4E (Chlorpyrifos) have been widely used for controlling insect pests of sugarbeet. In North Dakota and Minnesota, the sugarbeet crop received and average of 0.7 insecticide application per season. The insecticides most used were Counter 15G followed by Lorsban 15G. The Sugarbeet Root Maggot has not developed resistance to Counter 15G nor Lorsban 15G although sugarbeet growers have been using these insecticides for over 25 years.
Species 1: Diptera Otitidae Tetanops myopaeformis (sugarbeet root maggot)
Keywords: survey, organophosphates
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