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首页> 外文期刊>Tropical Animal Health and Production >The bioefficacy of crude extracts of Azadirachta indica (Meliaceae) on the survival and development of myiasis-causing larvae of Chrysomya bezziana (Diptera: Calliphoridae)
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The bioefficacy of crude extracts of Azadirachta indica (Meliaceae) on the survival and development of myiasis-causing larvae of Chrysomya bezziana (Diptera: Calliphoridae)

机译：印A粗提物对引起zz虫的幼虫存活和发育的生物功效（双翅目：Calliphoridae）

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摘要

Myiasis is a type of parasitosis originating from the invasion of tissues of live humans and other vertebrates by dipteran larvae. The Old World screwworm fly-Chrysomya bezziana-is known worldwide in the tropical regions for causing myiasis among man and domestic animals, thereby leading to health hazards and severe economic losses to the dairy farmers. Management techniques for controlling populations of the fly are needed to minimize these losses. Plant-derived materials have been increasingly evaluated these days in controlling the insects of medical and veterinary importance. This study evaluated the efficacy of crude extracts of the plant neem, Azadirachta indica, against C. bezziana. The dried leaves of the plant were extracted successively with four different solvents viz. petroleum ether, chloroform, ethyl acetate and methanol and were evaluated against the third instar larvae of C. bezziana using dipping method and thin film application technique. In the dipping method, larvae were dipped in four different concentrations of plant extracts for 30 s, whereas in the thin film application, they were exposed to a thin film of plant extracts. The results showed that all the extracts had toxic effect on the larvae in both the techniques. In the dipping method, the highest mortalities were recorded in methanol extract followed by chloroform, petroleum ether and ethyl acetate extracts with LC50 values 1.07 g/100 ml, 1.7 g/100 ml, 3.39 g/100 ml and 4.9 g/100 ml, respectively. In the thin film application method, methanol extract showed the highest mortalities followed by chloroform, ethyl acetate and petroleum ether with LC50 values 0.4 mg/cm(2), 0.6 mg/cm(2), 2.1 mg/cm(2) and 2.5 mg/cm(2). It is concluded that the crude extracts of A. indica can be used in controlling the larvae of C. bezziana by using the dipping as well as thin film application technique.
机译：肌病是一种寄生虫病，起源于二倍体幼虫侵袭活人和其他脊椎动物的组织。在热带地区，旧世界的螺蝇苍蝇（Chrysomya bezziana）在世界范围内广为人知，其原因是引起人畜和家畜的肌病，从而对健康造成危害，给奶农造成严重的经济损失。需要用于控制果蝇种群的管理技术以最小化这些损失。如今，在控制具有医学和兽医学重要性的昆虫方面，越来越多地评估了植物来源的材料。这项研究评估了印度ne树印em粗提物对C. bezziana的功效。用四种不同的溶剂连续提取植物的干燥叶子。石油法，氯仿，乙酸乙酯和甲醇，并使用浸涂法和薄膜应用技术对贝桑假丝酵母的三龄幼虫进行了评估。在浸渍方法中，将幼虫浸入四种不同浓度的植物提取物中30秒钟，而在薄膜应用中，将它们暴露于植物提取物的薄膜中。结果表明，两种提取物中所有提取物均对幼虫具有毒性作用。在浸渍法中，死亡率最高的是甲醇提取物，其次是氯仿，石油醚和乙酸乙酯提取物，LC50值为1.07 g / 100 ml，1.7 g / 100 ml，3.39 g / 100 ml和4.9 g / 100 ml，分别。在薄膜应用方法中，甲醇提取物的死亡率最高，其次是氯仿，乙酸乙酯和石油醚，LC50值分别为0.4 mg / cm（2），0.6 mg / cm（2），2.1 mg / cm（2）和2.5毫克/厘米（2）。结论是，通过浸涂和薄膜施用技术，in草的粗提物可用于防治贝氏假丝酵母的幼虫。

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