Performance of Selected Insecticides Against Stink Bugs Infesting Soybean, 2018

The performance of selected foliar insecticides treatments against stink bugs in soybean was evaluated at the Delta Research and Extension Center (Washington County). Soybean seed (Asgrow 46X6) were planted on a Sharkey clay soil on 28 June at a seeding rate of 117,612 seed/acre. Plot size was four rows (40 in centers) by 40 feet. Treatments were replicated four times in an RCB. Foliar insecticide treatments were applied on 31 August with a high-clearance sprayer with a compressed air spray system calibrated to deliver 10 gpa through TX-6 hollow cone nozzles (2/row) at 3.5 mph. Stink bug densities were determined by sampling one of the center two rows with a 15-in.-diameter sweep net. A sample consisted of 25 sweeps per plot. Because there was not one predominate species, counts for adults and nymphs of green stink bug and brown stink bug were pooled. Plots were sampled at 4, 7, and 10 d after treatment (DAT). The same row in each plot was not sampled on consecutive sample dates. Data were subjected to ANOVA and means separated according to Fisher’s protected least significant difference.

There were no differences in stink bug densities among treatments at 4 DAT (Table 1). At 6 and 8 DAT all of the insecticides, except Sivanto (both rates), Belay, and Sniper plus Belay reduced stink bug densities compared with the untreated check.¹

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