在与贫下中农一起用1059(内吸磷)防治棉蚜的多次生产实践中作者曾经注意到,一天之内不同时间喷药,药效有差异,傍晚喷药药效较好。这是一种偶然现象还是一种客观规律?我们请教了有丰富生产斗争经验的老贫农和老农工,他们说:“棉叶在中午以后会发干,可能吸收的药剂较多。”这个现象和老贫农的启发引起了我们的注意,因为它与内吸药剂的正确合理使用问题有关系。 In a number of production practices with low-yielding middle peasants using 1059 (internal phosphorus uptake) to control cotton aphid, the authors have noticed that spraying at different times of the day has different pharmacodynamic effects and better efficacy in the evening. Is this an accidental phenomenon or an objective law? We consulted with experienced poor peasants and veterans who had rich experience in the struggle for production. They said: “Cotton leaves will dry after noon and may absorb more chemicals.” This phenomenon Inspiration to old peasants caught our attention, because it is related to the proper use of systemic agents.