Integrated Multiple-tactic Management of the Redbanded Stink Bug on Soybeans in Louisiana

Abstract

Stink bugs (Hemiptera: Pentatomidae) are major pests of soybeans in Louisiana and heavy infestations often lead to economic losses. The stink bug species complex has changed in the past decade with the prevalence of the invasive redbanded stink bug, Piezodorus guildinii (Westwood), which causes greater damage than other stink bug species. Moreover, control of the redbanded stink bug has been faced with challenges because it is less sensitive to recommended insecticides. Therefore, studies were conducted to evaluate different control options for P. guildinii. Among the studies conducted was the current status of egg parasitoids of stink bugs in Louisiana. Telenomus podisi Ashmead (Hymenoptera: Platygastridae) was the predominant egg parasitoid of stink bugs. Field studies were also conducted to determine the combined effects of host plant resistance and insecticide application, on the abundance of stink bugs and their natural enemies. The soybean cultivar Pioneer 95Y20 had the least pest pressure, seed damage, and yields were higher from these plants. Insecticide application of thiamethoxam provided some control of stink bugs, although it did not impact yield. The combination of cultivar and insecticide application did not have a significant effect on natural enemies of stink bugs. Lastly, a study was also performed to demonstrate the effect of synthetic plant volatiles on natural enemies of stink bugs in the field. Results from this study showed that methyl jasmonate had a significant impact on the number of fire ants collected during a 5-minute time interval. Overall, results from this research provide important information on the integrated pest management (IPM) of P. guildinii and other stink bugs in Louisiana.