Abstract
Abstract One hundred and sixteen soybean plots (Cole) were located 3 miles southwest of Ames, Iowa. Each plot measured 50 ft by 4 rows (30 in. centers) and was bordered by 2 buffer rows. Experimental design was a randomized complete block, 4 blocks each with 29 treatments. Because of low larval numbers and large blocks, 2 checks were included. These checks were averaged by blocks for analyses. Treatments were applied on August 11, 1977 with two 4-row CO2-charged bicycle sprayers (liquid output was 41.75 ml/sec, at 30 and 36 psi for sprayers 1 and 2, respectively). Spray nozzles were Delavan HB6 70° Brass Tips. Weather conditions during application were: mostly clear, breeze ca 9 mph, temperature ca 80° F. Soybean plants were in maturity stage R5 (beans growing in size). Plants were sampled with a 15-in. diam. sweep-net (20 sweeps/plot) on 4 dates: August 11 (pretreatment), August 12 (1-day posttreatment), August 14 (4-day posttreatment), and August 18 7-day posttreatment). Samples were examined for green cloverworm larvae in the laboratory. Plants were in maturity group R5 on all sampling dates and were examined for visual signs of phytotoxicity, viz., leaf discoloration, on all sampling dates. Measureable rainfall during the experiment occurred on August 16 (2.80 in.).
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