The Insecticide Susceptibility Status of Aedes aegypti (Diptera: Culicidae) in Farm and Nonfarm Sites of Lagos State, Nigeria
The Insecticide Susceptibility Status of Aedes aegypti (Diptera: Culicidae) in Farm and Nonfarm Sites of Lagos State, Nigeria
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DOI：
10.1093/jisesa/iev045
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发表时间：
2015-06-23
影响因子：
2.2
通讯作者：
Otubanjo, O.
中科院分区：
文献类型：
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作者：
Ayorinde, A.;Oboh, B.;Otubanjo, O.
尼日利亚是疟疾流行国家之一。在尼日利亚拉各斯州，目前正在实施包括使用化学杀虫剂在内的各种疟疾病媒控制方案。这项研究旨在提供有关埃及伊蚊等非靶向媒介的敏感性状况的信息。成虫Ae.来自两个农场和一个非农场的埃及蚊子被暴露在世界卫生组织浸渍了0.05%溴氰菊酯、0.75%氯菊酯和4%滴滴涕杀虫剂的试纸中。测定染毒后24小时的击倒时间(KdT(50)和KdT(95))和死亡率。在所有接触氯氰菊酯的蚊子种群中，死亡率为98%(敏感性)，而非农场现场和农场现场的蚊子种群对溴氰菊酯的死亡率分别为95.8%(抗性)和98%(敏感性)。所有蚊子种群在2年内都对DDT产生了抗药性。其中一个农场和非农场的种群对滴滴涕的KDT(50)在2年内增加了(60.2-69.6)，而在另一个农场(68.9-199.96)减少了(243-63.4)。农场站点和非农场站点之间的KDT(50)有显著差异(P<；0.05)。埃及伊蚊在接触溴氰菊酯和滴滴涕后的第二年。在第一年接触溴氰菊酯后，KDT(95)增加。Ae的Kdt值较高，死亡率较低。非农场所的埃及伊蚊种群表明，在农业使用杀虫剂之外，存在选择杀虫剂抗性的现有因素。
Nigeria is one of the malaria-endemic countries. In Lagos State, Nigeria, various malaria vector control programs including the use of chemical insecticides are currently being implemented. This study was designed to provide information on the susceptibility status of some nontargeted vectors such as Aedes aegypti. Adult Ae. aegypti mosquitoes from two farm sites and a nonfarm site were exposed to World Health Organization test papers impregnated with Deltamethrin (0.05%), Permethrin (0.75%), and DDT (4%) insecticides. The Knockdown time (KdT(50) and KdT(95)) and percentage mortality after 24 h post exposure were determined. In all the exposed mosquito populations to permethrin, mortality rate > 98% (susceptibility) was recorded, whereas mortality rates < 95.8% (resistance) and > 98% (susceptibility) to deltamethrin were observed in the nonfarm site and farm sites mosquito populations, respectively. All the mosquito populations were resistant to DDT in 2 yr. The KdT(50) of the populations to DDT increased (60.2-69.6) in one of the farm sites and the nonfarm site (68.9-199.96), while a decrease (243-63.4) in another farm site in 2 yr. Significant difference (P < 0.05) in KdT(50) was recorded between the farm and nonfarm sites Ae. aegypti mosquitoes in the second year after exposure to deltamethrin and DDT. An increase in KdT(95) after exposure to deltamethrin in the first year was recorded. Higher KdT values and lower mortality rates in Ae. aegypti populations in the nonfarm sites are indications there are existing factors selecting for insecticide resistance outside agricultural use of insecticides.