D3469: Exploring alternative insecticides for managing redbanded stinkbug infestation in Louisiana soybean crops

The redbanded stinkbug, Piezodorus guildinii, is the most damaging insect pest of soybeans in Louisiana. These insects have piercing-sucking mouthparts that allow them to feed on various parts of the soybean plant, including foliage, stems, pods, and seeds, extracting essential nutrients, and causing substantial damage. Feeding injury by redbanded stinkbug can result in significant reductions in seed quality and yield, often up to 55% when left untreated. This study was conducted to evaluate the efficacy of commercially available insecticides on natural infestations of redbanded stinkbugs across multiple locations in Louisiana. Field trials were established at Dean Lee Research and Extension Center in Alexandria, Northeast Research Station in St. Joseph, Macon Ridge Research Station in Winnsboro, and Red River Research Station in Bossier. For each location ten treatments will be evaluated, including two Acephate, Acephate combined with Bifenthrin, Bifenthrin alone, Bifenthrin combined with Imidacloprid, Lambda-cyhalothrin, Lambda-cyhalothrin-Thiamethoxam, Neonicotinoid, Isocycloseram, and an Untreated Control. The experimental design for each location was four blocks with one replicate treatment per block and a plot size of 4 rows by 50 feet. Treatment applications were carried out when the population of redbanded stinkbugs reached four (nymphs and adults)_per 25 sweeps per plot. Stink bug numbers were evaluated at 0, 3, 7, and 14 days after treatment. Results are forthcoming.

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