Effects of Spray Drop Size and Distribution of Drops Containing Bifenthrin on Tetranychus urticae (Acari: Tetranychidae)

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Uniform drops of 120, 145, and 200 m containing 0.075% (0.18 g [AI]/liter) bifenthrin 2E were deposited on lima bean leaf disks (1.77 cm2) in distributions ranging from 0 to 182 drops per square centimeter to study effects on the twospotted spider mite, Tetranychus urticae Koch. Based on regression analysis of data, egg deposition was reduced 80% with 41 drops per square centimeter of 120 m (0.007 g [AI]/cm2) or 18 drops per square centimeter of 200 m (0.014 g [AI]/cm2). The 41 drops per square centimeter of 120m correspond to 3.7 liters/ha and 18 drops per square centimeter of 200 m correspond to 7.5 liters/ha. Eighty percent of the mites were repelled from leaf disks with either 251 drops per square centimeter of 120m (0.041g [AI]/cm2) or 51 drops per square centimeter of 200 m (0.040 g [AI]/cm2). Droplets of 120 m were more efficient in pesticide and water usage than 200-m drops in decreasing egg production and nearly as efficient in repelling adult mites.

Document Type: Research Article

Publication date: April 1, 1987

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