The toxic effect of novel insecticides to mosquito (Aedes albopictus) and its resistance

• Main Authors: Wan–Lin Shen, 沈婉琳
• Other Authors: Shun-Cheng Wang
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/71750124009737420018

碩士 === 朝陽科技大學 === 環境工程與管理系 === 102 === Aedes albopictus is one of the major vectors that transmit dengue fever. This study tested the toxicity of eight insecticides against the larvae of susceptible and field strain of Aedes albopictus to monitor the occurrence of resistance to recommended insecticides in this mosquito species in Taiwan and to evaluate the potential use of novel insecticides to control it. The author also compared the results of this study with other past studies in Taiwan and around the world to find out the specific development of resistance of Aedes albopictus to commonly used insecticides around the world. In addition to this, we compared the control efficacy of and resistance to the same insecticides of Aedes albopictus and another key vector of dengue fever – Aedes aegypti, to find out the differences between these two mosquito species and among diffenent strains. The results showed Aedes albopictus is highly resistant to Deltamethrin in 2013, with the resistance ratios RR1 (based on LC50) and RR2 (based on LC90) as high as 23.7 and 23.1, respectively. And has a higher resistance to Chlorpyrifos, with RR1 and RR2 of 5.6 and 7.9, respectively. The RR1 and RR2 values of other recommended control agents such as Abamectin, and BTI ranged from 1.2 to 3.1. The RR1 and RR2 values of insecticides that with new action mechanisms, Emamectin benzoate, Indoxacarb, Fipronil, and Spinosad, ranged from 0.2 to 2.0. This indicates these insecticides have the potential to be applied to control Aedes albopictus. Over the years 2008-2013, Aedes albopictus has developed a high resistance level to Chlorpyrifos, an organophosphate, Deltamethrin, a pyrethrum, but remains susceptible to Abamectin, and Bacillus thuringiensis (BTI) with no resistnce induced. The efficacy of these insecticides is substantially the same for Aedes aegypt, only differs in Aedes aegypt has a higher resistance to Indoxacarb, with a RR1 and RR2 of 3.3 and 3.0, respectively.