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首页> 外文期刊>Frontiers in Public Health >Identification of the Temperature Induced Larvicidal Efficacy of Agave angustifolia against Aedes, Culex, and Anopheles Larvae
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Identification of the Temperature Induced Larvicidal Efficacy of Agave angustifolia against Aedes, Culex, and Anopheles Larvae

机译：鉴定龙舌兰对伊蚊，库蚊和按蚊幼虫的温度诱导杀幼虫功效。

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Synthetic insecticides are generally employed to control the mosquito population. However, their injudicious over usage and non-biodegradability are associated with many adverse effects on the environment and mosquitoes. The application of environment-friendly mosquitocidals might be an alternate to overcome these issues. In this study, we found that organic or aqueous extracts of Agave angustifolia leaves exhibited a strong larvicidal activity (LD50 28.27 μg/ml) against Aedes aegypti, Culex quinquefasciatus, and Anopheles stephensi larvae within a short exposure of 12 h. The larvicidal activity of A. angustifolia is inherited and independent of the plants vegetative growth. Interestingly, the plant larvicidal activity was observed exclusively during the summer season (April–August, when outside temperature is between 30 and 50°C) and it was significantly reduced during winter season (December–February, when the outside temperature falls to ~4°C or lower). Thus, we hypothesized that the larvicidal components of A. angustifolia might be induced by the manipulation of environmental temperature and should be resistant to the hot conditions. We found that the larvicidal activity of A. angustifolia was induced when plants were maintained at 37°C in a semi-natural environment against the controls that were growing outside in cold weather. Pre-incubation of A. angustifolia extract at 100°C for 1 h killed 60% larvae in 12 h, which gradually increased to 100% mortality after 24 h. In addition, the dry powder formulation of A. angustifolia, also displayed a strong larvicidal activity after a long shelf life. Together, these findings revealed that A. angustifolia is an excellent source of temperature induced bioactive metabolites that may assist the preparedness for vector control programs competently.
机译：通常使用合成杀虫剂来控制蚊子种群。但是，它们对使用和非生物降解性的有害影响与对环境和蚊子的许多不利影响有关。应用环境友好的灭蚊剂可能是克服这些问题的替代方法。在这项研究中，我们发现龙舌兰叶的有机或水性提取物在短短的12h内表现出较强的杀幼虫活性（LD50为28.27μg/ ml），对埃及伊蚊，库克斯库克斯瓜和按蚊按蚊幼虫具有很强的杀幼活性。 Agustantolia的杀幼虫活性是遗传的，并且与植物的营养生长无关。有趣的是，仅在夏季（4月至8月，室外温度在30至50°C之间）观察到植物的杀幼虫活性，而在冬季（12月至2月，室外温度降至〜4℃时）则明显降低了杀幼虫活性。 °C或更低）。因此，我们假设操作环境温度可能诱导了A. angustifolia的幼虫成分，并且应该对高温条件具有抵抗力。我们发现，当植物在半自然环境中保持在37°C时，相对于在寒冷的天气中生长在外面的对照，可以诱导出A. angustifolia的杀幼虫活性。在100°C下预孵育1°h时，在12°h下杀死60％的幼虫，在24°h后逐渐增加到100％的死亡率。此外，A。angustifolia的干粉制剂在长期保存后也表现出很强的杀幼虫活性。在一起，这些发现表明，A。angustifolia是温度诱导的生物活性代谢产物的极好来源，可以有效地帮助媒介控制程序的准备。

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