一、使用前，必须了解制种亲本特征特性，由于制单交种亲本都是自交系，不同自交系的抗逆性不同，对于未经试验过的自交系使用除草剂要极其慎重，故此必须了解哪些自交系有抗药性，哪些比较抗药，根据自交系的特征特性选择除草剂，可避免药害发生。二、使用时，必须按照用量要 First, before use, we must understand the characteristics of seed production characteristics, since the system of single cross-breeding parents are inbred lines, different inbred lines of different resistance, herbicide must be used with an untested inbred line to be extremely cautious Therefore, it is necessary to know which inbred lines are resistant and which are more resistant to diseases. The selection of herbicides according to the characteristics of inbred lines can prevent the occurrence of phytotoxicity. Second, use, must be used in accordance with the amount