According to the author's experience in the control of cotton aphids.the systemic insecticidal action of Systox was different when it was applied at different times of the day.

正>在与贫下中农1059(内吸磷)防治棉蚜的多次生产实中作者曾经注意到,天之内不喷药,药效有差异,傍晚喷药药效较好。