Role of Teflubenzuron as A Chitin Synthesis Inhibitor Against Spodoptera littoralis Larvae

H. Mead, M. Khedr
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引用次数: 2

Abstract

The present research focuses on the effect of teflubenzuron on the 4th larval instar of the cotton leafworm, Spodoptera littoralis under laboratory conditions. Teflubenzuron exhibited larvicidal activity (LC50 8.45 ppm) after 72 hours of treatment. Scanning electron microscopy (SEM) showed growth disruption and abnormalities in the external morphological features of cuticle and head capsule in larvae treated with teflubenzuron. Marked biochemical changes in chitin synthesis pathway were recorded. Protease enzyme activity was significantly reduced, whereas the activities of both chitinase and phenoloxidase were significantly elevated in treated larvae in comparison to controls.
氟虫脲对沿海夜蛾幼虫几丁质合成抑制剂的作用
本研究在实验室条件下研究了氟虫脲对棉花叶虫4龄幼虫的影响。对氟虫脲处理72 h后,LC50值为8.45 ppm。扫描电镜(SEM)显示,氟虫脲处理后的幼虫生长中断,角质层和头囊的外部形态特征出现异常。几丁质合成途径有明显的生化变化。蛋白酶活性显著降低,几丁质酶和酚氧化酶活性显著升高。
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