Susceptibility of Southern Green Stink Bug and Redbanded Stink Bug to Insecticides in Soybean Field Experiments and Laboratory Bioassays

Abstract

Recently the redbanded stink bug, Piezodorus guildinii (Westwood), has become a major pest of soybean, Glycine max (L.) Merrill, in Louisiana and has begun to infest soybeans throughout the Mid-South. Soybean industry and cooperative extension personnel have reported differential susceptibility between the southern green stink bug, Nezara viridula L., and redbanded stink bug treated with currently labeled insecticides in commercial production fields. To address their concern, we evaluated susceptibility of southern green stink bug and redbanded stink bug to insecticides in field and laboratory experiments. Insecticide field efficacy experiments during 5 years indicated control with pyrethroids was 94.4 ± 1.3% for southern green stink bug and 75.1 ± 1.9% for redbanded stink bug, with organophosphates, 89.8 ± 2.7% for southern green stink bug, and 84.8 ± 1.7% for redbanded stink bug, and with neonicotinoid insecticides, 78.0 ± 5.6 and 63.2 ± 6.0%, respectively. Insecticide pre-mixtures or product combinations provided 98.6 ± 0.6 and 83.8 ± 2.4% control, respectively. Bioassays of adults in vials validated results in the field. Pyrethroid and organophosphate LC50 values ranged from 0.02 to 2.36 µg per vial for southern green stink bug and 0.21 to 4.86 µg per vial for redbanded stink bug. The redbanded stink bug was four to eight-fold less susceptible to pyrethroids and two to eight-fold less susceptible to organophosphates than was the southern green stink bug.