Abstract
Abstract This test was conducted at Neb. Agric. Exp. Stn. Field Lab., Mead, Nebr. in grain sorghum planted 2 June. Plots were three rows, 6.1 m long. Plots were separated by two untreated buffer rows to minimize spray drift between treatments. Treatments were replicated three times in a randomized complete block design. Sprays were applied by a bicycle-wheeled plot sprayer at 2.109 kg/cm2 and 246.8 liters/ha through a boom fitted with one top nozzle and two drop nozzles per row. The liquids were propelled with pressurized CO2. Granular treatments were applied with a Gandy applicator mounted on a Lilliston cultivator in 17.8-cm bands directly over the plant row. Treatments were applied 26 July at which time plants were in the boot stage. Temperature at application time was 32.8°C and rainfall during the posttreatment sampling period was measurable on 29 July (0.635 cm) and 31 July (4.32 cm). The efficacy of each insecticide was evaluated by counting live greenbugs on each of 5 plants selected at random from the center row of each plot at 5 and 10 days posttreatment.
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