棉花苗期在遇到低温阴雨的天气时,易受病菌侵害,造成死苗僵苗,特别是炭疽病和黄枯萎病的危害,会造成无法挽回的巨大损失,所以,棉苗的防病治病工作不容忽视。1.杀菌剂有两种类型,在选择使用杀菌剂时,要弄清杀菌剂的性质。预防植物发病的杀菌剂又称保护剂,如波尔多液、代森锰锌、 Cotton seedlings in the face of cold and rainy weather, susceptible to pathogenic bacteria, resulting in dead seedling seedlings, especially the hazards of anthracnose and yellow blight, will cause enormous losses irreparable, so cotton seedling disease prevention and treatment Ill work can not be ignored. 1. There are two types of fungicides, fungicides in the choice of use, we must find out the nature of fungicides. Prevent plant pathogens fungicides, also known as protective agents, such as Bordeaux mixture, mancozeb,