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Redbanded stinkbug nymphs (left) and adult (right). Photo by: J. Villegas
Redbanded stinkbugs (RBSBs) are arguably the most important insect pest of soybean in Louisiana. RBSBs are medium-sized stink bugs with a distinctive reddish band across their backs. When flipped, you will notice a characteristic spine protruding between the hind legs. Their piercing-sucking mouthparts allow them to feed on various plant parts, including stems, pods, and seeds. RBSBs are primarily found in the southern regions, where soybean production is prevalent, but their range has been expanding in recent years. Unlike other stinkbug species, RBSBs exhibit extended feeding behavior, necessitating continued control measures beyond the R6 growth stage. If left unchecked, RBSBs can cause significant reductions in soybean yields and quality, especially as they pierce deeper into pods, leading to weight reductions and potential elevator dockage.
To effectively manage RBSB, regular scouting using a sweep net should be conducted. Early detection allows for timely intervention and more effective control. The threshold for RBSB is 4 bugs (nymphs and adults) per 25 sweeps. Whereas for southern green, green, and brown stinkbugs, the threshold is 9 bugs (nymphs and adults) per 25 sweeps. Extend control measures for RBSB until maturity to protect soybeans from sustained feeding. Rotate chemistries to avoid resistance development.
LSU AgCenter Insecticide recommendations for redbanded stinkbugs in soybean.
| Insecticide | Amount per Acre (fl oz) | Pounds Active Ingredient | Acres Treated per Gallon or Pound SP |
| acephate Orthene | 12-16 oz. | 0.75-1.0 | 1.3-1 |
| thiamethoxam, lambda-cyhalothrin Endigo ZC | 4.5 oz. | premix | 28.4 |
| bifenthrin Brigade (2) | 6.4 oz. | 0.1 | 20 |
| bifenthrin, z-cypermethrin Hero (1.24) | 10.3 oz. | 0.1 | 12.4 |
| imidacloprid, beta-cyfluthrin Leverage 360 | 2.8 oz. | premix | 45.7 |
| clothianidin Belay (2.13) | 4.0 oz. | 0.067 | 32 |
*Note – 0.5 lb of acephate applied alone does not provide satisfactory control.
