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首页> 外文期刊>Journal of Economic Entomology >Optimal Discriminating Concentrations of Six Synthetic Pyrethroids for Monitoring Insecticide Susceptibility in Anopheles minimus (Diptera: Culicidae), a Primary Malaria Vector in Thailand
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Optimal Discriminating Concentrations of Six Synthetic Pyrethroids for Monitoring Insecticide Susceptibility in Anopheles minimus (Diptera: Culicidae), a Primary Malaria Vector in Thailand

机译：六种合成拟除虫菊酯的最佳区分浓度，用于监测杀虫剂的杀虫剂易感性（Diptera：Culicidae），泰国主要疟疾载体

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摘要

Malaria is a serious mosquito-borne disease transmitted to humans by Anopheles mosquitoes. Seven species of Anopheles are important malaria vectors in Thailand and all remain susceptible to pyrethroid insecticides, despite decades of use in public health mosquito control programs. However, for a more refined and accurate approach to temporal monitoring of susceptibility patterns to commonly used pyrethroids to control adult Anopheles mosquitoes, it is preferred to have specific concentrations for more discriminating testing. A laboratory strain of Anopheles minimus Theobald was used to establish baseline concentrations for susceptibility to six different synthetic pyrethroids-deltamethrin, permethrin, bifenthrin, cypermethrin, alpha-cypermethrin, and lambda-cyhalothrin using the World Health Organization (WHO) adult bioassay system. Final discriminating concentrations of each active ingredient were determined based on doubling LC99 for each chemical to arrive at the following percent concentrations: deltamethrin (0.009%), permethrin (0.551%), bifenthrin (0.12%), cypermethrin (0.104%), alpha-cypermethrin (0.034%), and lambda-cyhalothrin (0.019%). For permethrin, deltamethrin, alpha-cypermethrin, and lambda-cyhalothrin, all revised percentages were lower than currently recommended discriminating concentrations by WHO. Using the newly derived concentrations, insecticide susceptibility tests were followed in a field population of An. minimus s.l. from Kanchanaburi Province. Deltamethrin, bifenthrin, and lambda-cyhalothrin produced 100% kill, whereas permethrin, cypermethrin, and alpha-cypermethrin gave between 92.9 and 97.7% mortality, indicating lower sensitivity (tolerance). Routine monitoring of insecticide susceptibility in An. minimus wild populations throughout Thailand should continue to ensure that insecticides in use are effective to control this vector species.
机译：疟疾是一种严重的蚊媒疾病，由按蚊传播给人类。在泰国，七种按蚊是重要的疟疾媒介，尽管在公共卫生蚊子控制项目中使用了几十年，但它们仍然对拟除虫菊酯杀虫剂敏感。然而，为了更精确地对常用拟除虫菊酯的敏感性模式进行时间监测，以控制成年按蚊，最好采用特定浓度进行更具鉴别性的测试。使用世界卫生组织（WHO）成人生物测定系统，使用微小按蚊Theobald实验室菌株建立了对六种不同合成拟除虫菊酯溴氰菊酯、氯菊酯、联苯菊酯、氯氰菊酯、α-氯氰菊酯和λ-氯氟氰菊酯敏感性的基线浓度。每种活性成分的最终鉴别浓度是根据每种化学品的LC99加倍来确定的，以达到以下百分比浓度：溴氰菊酯（0.009%）、氯菊酯（0.551%）、联苯菊酯（0.12%）、氯氰菊酯（0.104%）、α-氯氰菊酯（0.034%）和氯氟氰菊酯（0.019%）。对于氯菊酯、溴氰菊酯、α-氯氰菊酯和λ-三氟氯氰菊酯，所有修订百分比均低于世卫组织目前建议的鉴别浓度。使用新获得的浓度，在一个村庄的田间种群中进行了杀虫剂敏感性试验。来自坎查纳布里省的minimus s.l。溴氰菊酯、联苯菊酯和三氟氯氰菊酯的杀灭率为100%，而氯菊酯、氯氰菊酯和α-氯氰菊酯的死亡率为92.9%至97.7%，表明敏感性较低（耐受性）。在实验室对杀虫剂敏感性进行常规监测。泰国各地的微小野生种群应继续确保使用的杀虫剂能有效控制该病媒物种。

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