Younoussa Lame, Nukenine Elias Nchiwan, Esimone Charles Okechukwu
Department of Biological Sciences, Faculty of Science, University of Ngaoundere, Ngaoundere, Cameroon.
Department of Pharmaceutical Microbiology and Biotechnology, Faculty of Pharmaceutical Sciences, Nnamdi Azikiwe University, Awka, Nigeria.
Int J Insect Sci. 2016 May 12;8:23-31. doi: 10.4137/IJIS.S37188. eCollection 2016.
Mosquitoes are vectors of several human pathogens, and great attention has recently been placed on insecticides from plant-derived products, in search for mosquito control agents. This study, thus, investigated the potency of Boswellia dalzielii methanol leaf extract and its four fractions as mosquito ovicide, larvicide, and pupicide against Anopheles gambiae and Culex quinquefasciatus. The plant products were tested at the following concentrations: 125, 250, 500, 1000, and 2000 ppm on eggs and 312.5, 625, 1250, and 2500 ppm on the larvae and pupae of the mosquitoes. For results, hatchability of A. gambiae eggs was reduced to 5% with n-hexane fraction at 2000 ppm. Among the plant products tested, n-hexane fraction was most toxic against A. gambiae (LC50 = 385.9 ppm) and C. quinquefasciatus (LC50 = 3394.9 ppm). The n-hexane fraction of B. dalzielii might be used as a mosquitocidal agent in the breeding sites of A. gambiae and C. quinquefasciatus.
蚊子是多种人类病原体的传播媒介，最近人们十分关注源自植物产品的杀虫剂，以寻找控制蚊子的药剂。因此，本研究调查了乳香（Boswellia dalzielii）甲醇叶提取物及其四个馏分对冈比亚按蚊（Anopheles gambiae）和致倦库蚊（Culex quinquefasciatus）作为杀蚊卵剂、杀幼虫剂和杀蛹剂的效力。这些植物产品在以下浓度下进行测试：对蚊卵为125、250、500、1000和2000 ppm，对蚊子的幼虫和蛹为312.5、625、1250和2500 ppm。结果显示，在2000 ppm下，正己烷馏分可使冈比亚按蚊卵的孵化率降至5%。在所测试的植物产品中，正己烷馏分对冈比亚按蚊（LC50 = 385.9 ppm）和致倦库蚊（LC50 = 3,394.9 ppm）毒性最大。乳香的正己烷馏分可在冈比亚按蚊和致倦库蚊的繁殖地用作杀蚊剂。
