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Q&A ViewAttendees 2

Plant-Insect Ecosystems

10-Minute Paper

P-IE: IPM - General

Monitoring potential lambda-cyhalothrin resistance in rice stink bug, Oebalus pugnax populations in Arkansas

Tuesday, November 2, 2021
3:06 PM - 3:18 PM MT
Location: Colorado Convention Center, Meeting Room 301-303
In-Person

Rice stink bug (RSB) (Oebalus pugnax) is a major pest of rice, feeding on the developing grain. Few insecticides are available to rice producers for RSB management and those labeled, lack residual control. Lambda-cyhalothrin (Lambda) is the most used insecticide for control of RSB providing good control at low cost. Over 90% of rice acreage treated for RSB will be Lambda. Other options, such as Tenchu (Dinotefuran), are effective for control but at a much higher cost. The high level of usage of one product, and control issues in Louisiana and Texas, raises concern for resistance of RSB with Lambda. New options for RSB need to be evaluated if resistance to Lambda is documented. Large block trials were conducted in 2019, 2020, and 2021 to compare Lambda and Tenchu for efficacy and residual control of rice stink bug. Sweep net samples were taken pre-application, and every 2-3 days post-application for two weeks to monitor RSB. Additionally, assays were conducted on multiple RSB populations in 2019, 2020, and 2021 from fields where RSB were found soon after an application of Lambda. RSB collections were made. Lambda was applied to petri dishes at five different rates with an untreated for comparison with 10 replications. Dishes were allowed to dry then five RSB were placed in each dish. Mortality was assessed at 8 and 24 hours after infestation.