Toxicity and mechanism of rotenone and its mixture against Spodoptera litura larvae
The low insecticidal activity of rotenone against Spodoptera litura has been studied while its mechanism was not.To demonstrate the biochemical mechanism of the high tolerance of S.litura to rotenone and determining an effective synergist to improve the insecticidal activity of rotenone, this study was carried out.Result shows the cotoxicity coefficient of rotenone + cinnamon oil was 213.52.After rotenone treatment, a considerable amount of rotenone was discharged, but extremely low levels were found in the ventral nerve cord and brain.By contrast,the rotenone + cinnamon oil treatment group showed an increased amount of rotenone in the ventral nerve cord and brain.The midgut cells of rotenone and control groups exhibited no significant differences, whereas those of the rotenone + cinnamon oil group were extremely different because of the larger spaces between them.These findings suggest that rotenone alone could not effectively penetrate the midgut, which may be attributed to its low toxicity against S.litura.The rotenone + cinnamon oil mixture could change the midgut cell spacing and their membrane, thus effectively increasing rotenone toxicity.
Rotenone Spodoptera litura Cinnamon oil Paraffin section
Zihao Li Rilin Huang Weisheng Li Dongmei Cheng Runqian Mao Z.X.Zhang
Key Laboratory of Natural Pesticide and Chemical Biology, Ministry of Education, South China Agricul Department of Plant Protection, Zhongkai University of Agriculture and Engineering, Guangzhou,China, Guangdong Entomological Institute/Guangdong Provincial Public Laboratory on Wild Animal Conservation Key Laboratory of Natural Pesticide and Chemical Biology, Ministry of Education, South China Agricul
国内会议
南宁
英文
93-109
2016-11-04（万方平台首次上网日期，不代表论文的发表时间）