Trials were conducted in corn fields having populations of corn rootworm beetles to determine the influenceof application equipment and parameters on the efficacy of a semiochemical-based insecticide. The spray applicationequipment and operational parameters were varied to produce three droplet sizes, three applied product rates (kg ofproduct/ha), and three spray rates (spray volume in L/ha) to evaluate the effects on product efficacy. Two formulations ofthe product, which vary only in manufacturing process, were also evaluated. Beetle populations were monitored usingemergence cages, sticky traps, cone traps, and whole plant counts. The efficacy of the product was measured in terms ofpercent reduction in beetle numbers from pretreatment levels. Large droplets [> 800 m volume median diameter (DV0.5)]did not reduce adult populations as effectively as small (300 m DV0.5) and medium (600 m DV0.5) size droplets. Sprayrate (4.7-14.1 L/ha) did not affect the efficacy of the product. Product rates ranging from 0.28 to 0.56 kg/ha resulted insimilar levels of control.
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Hoffmann et al. (1998) studied this question.