Optimal dosage of Meiyiwei (0.45% tetramethrin＋0.05% cypermethrin) bait for the control of Solenopsis invicta Buren
Author of the article:HUANG Jun1, 2** LU Yong-Yue1 LIANG Guang-Wen1 ZENG Ling1***
Author's Workplace：1. Red Imported Fire Ant Research Centre, South China Agricultural University, Guangzhou 510642, China; 2. Flower Research and Development Centre, Cotton and Flax Research Institute, Zhejiang Academy of Agricultural Sciences, Hangzhou 311202, China
Key Words：Solenopsis invicta, active mound decreasing rates, chemical control, poisonous bait
Abstract：[Objectives] To determine the optimal dosage of Meiyiwei (0.45% tetramethrin＋0.05% cypermethrin) bait. [Methods] The effect of Meiyiwei (0.45% tetramethrin＋0.05% cypermethrin) on fire ants was evaluated using an integrated index. [Results] The mortality of fire ant colonies treated with dosages of 25, 20, 15, 10, 5 g per mound were 80%, 90%, 100%, 90% and 90%, respectively; the mortality of fire ant workers were 100%, 100%, 100%, 98.1% and 99.2%, respectively, and the control effect were 89.4%, 93%, 100%, 87.4%, 86.1%, respectively, after 25 days. The application of practical quantities of Meiyiwei achieved a control effect in excess of 94% depending on different mound volume and dosage. [Conclusion] 15 g Mieyiwei per mound had the best control effect, and in general, 5 g of this pesticide should be applied per 0.03 m3 of mound volume.