Abstract
Blickenstaff-Peckenpaugh traps were used to quantify the relationship between density of the adult Tetanops myopaeformis (Roder) and sugarbeet yield loss caused by subsequent larval feeding. The cumulative number of flies trapped from the beginning of the growing season until peak fly collection was the most reliable and easy-to-use predictor of sugarbeet crop loss. Cumulative capture of 34 flies was adopted as the damage boundary, the minimum density required to produce detectable root yield loss. Action thresholds for larval management with insecticides were derived as a function of fly density, crop market value, larval control costs, and insecticide efficacy. Thresholds ranged from 38 to 61 cumulative flies per trap at peak. Practical recommendations for using the thresholds are discussed.
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