Efficacy of Selected Insecticides Against Stink Bugs in Soybean 5, 2020

The performance of selected insecticides against stink bug species infesting soybeans was evaluated at the Delta Research and Extension Center (Washington County). The soybean variety Asgrow 46X6 was utilized in this trial, and the trial was planted on 1 Jul. The soil was a Bosket very fine sandy loam soil, and the seeding rate was 117,612 seed per acre. Plot size was four rows (40 in centers) by 40 feet. Treatments were replicated four times in a RCB. Foliar insecticide treatments were applied with a high-clearance sprayer with a compressed air spray system calibrated to deliver 10 gpa through TX-12 hollow cone nozzles (2 per row) at 5 mph on 18 Sep. Stink bug densities were determined by sampling one of the center two rows with a 15-inch-diameter sweep net. A sample consisted of 25 sweeps per plot. Plots were sampled at 3, 7, 11, and 14 DAT. The same row in each plot was not sampled on consecutive sample dates. Stink bug adults and nymphs were pooled for analysis and presentation in this report. Data were subjected to ANOVA and means separated according to Fisher’s Protected LSD.

All of the insecticides reduced redbanded stink bug densities compared to the untreated check at 3 and 7 DAT (Table 1). There were no differences among treatments at 11 DAT. At 14 DAT all of the insecticides, except Wrangler and Sniper plus Belay, reduced redbanded stink bug numbers compared to the untreated check. All of the insecticides reduced total stink bugs compared to the untreated check at 3 and 7 DAT (Table 2). At 11 DAT all of the insecticides, except Sniper, Wrangler, Belay, or Sniper plus Belay, reduced stink bug densities compared to the untreated check. All of the insecticide treatments, except Wrangler, Belay, and Sniper plus Belay, resulted in lower stink bug densities that the untreated check at 14 DAT.¹

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