Sharma Preeti, Mohan Lalit, Srivastava C N
Applied Entomology & Vector Control Laboratory, Department of Zoology, Faculty of Science, Dayalbagh Educational Institute (Deemed University), Dayalbagh, Agra-282 005, India.
J Environ Biol. 2005 Oct;26(4):657-60.
Ethanolic and acetone extracts of Nerium indicum and Thuja orientelis have been studied against III instar larvae of Anopheles stephensi and Culex quinquefasciatus. Ethanolic extract of N. indicum is found more effective than its acetone extract against anopheline larvae with LC50 values of 185.99 and 148.05 ppm for former and 229.28 and 149.43 ppm for the later after 24 and 48 hrs of exposure. The acetone extract with LC50 values of 209.00 and 155.97 ppm is more effective in case of culicine larvae than its ethanolic extract with LC50 494.07 and 194.49 ppm after 24 and 48 hours of treatment. Ethanolic extract of T. orientelis is more effective against both the larval species with LC50 values of 13.10 and 9.02 ppm after 24 and 48 hours for anopheline and 22.74 and 16.72 ppm against culicine larvae. The acetone extract showed LC50 values of 200.87 and 127.53 ppm against anopheline and 69.03 and 51.14 ppm against culicine larvae. Thus ethanolic extract of T. orientelis is an ideal potential larvicide for both types of mosquito larvae.
已对夹竹桃和侧柏的乙醇提取物及丙酮提取物针对斯氏按蚊和致倦库蚊的三龄幼虫进行了研究。夹竹桃的乙醇提取物对按蚊幼虫的效果比其丙酮提取物更好，暴露24小时和48小时后，前者的LC50值分别为185.99 ppm和148.05 ppm，后者分别为229.28 ppm和149.43 ppm。对于库蚊幼虫，LC50值为209.00 ppm和155.97 ppm的丙酮提取物比LC50值为494.07 ppm和194.49 ppm的乙醇提取物在处理24小时和48小时后更有效。侧柏的乙醇提取物对两种幼虫均更有效，对按蚊幼虫暴露24小时和48小时后的LC50值分别为13.10 ppm和9.02 ppm，对库蚊幼虫的LC50值分别为22.74 ppm和16.72 ppm。丙酮提取物对按蚊幼虫的LC50值为200.87 ppm和127.53 ppm，对库蚊幼虫的LC50值为69.03 ppm和51.14 ppm。因此，侧柏的乙醇提取物是两种类型蚊虫幼虫的理想潜在杀幼虫剂。
