苜蓿蚜(Aphis medicagenis Koch)和棉长管蚜(Aeyrthosiphom gossypii Mordv)是玛纳斯河流域主要的棉花蚜虫.前者自一九五二年至一九五八年逐年严重发生,其中以一九五四及一九五六年为害最烈,为棉花苗期的主要害虫之一;近年来由于注意防治,为害已减轻.后者以往发生轻微,为害不重,末注意防治,因而有逐年发展的趋势.兹将近年来对棉长管蚜消长情况的调查结果报导出来,以供参考. Aphis medicagenis Koch and Aeyrthosiphom gossypii Mordv are the major cotton aphids in the Manas River basin.The former occurred annually from 1952 to 1958, In 1956, it was one of the major pests in cotton seedling stage, and its harm has been alleviated in recent years due to its prevention and control. The former has suffered minor injuries and the latter has not been harmed. Therefore, it has been developed year by year In recent years, we will report the results of the survey on the growth and decline of cotton aphids in recent years for reference.