在选择杀菌剂时要弄清杀菌剂的性质。杀菌剂有两种类型,一种是保护剂,这类杀菌剂是预防植物发病的,如波尔多液、代森锰锌、多菌灵等;另一种是治疗剂,是在植物发病后施用的,以杀灭或抑制侵入植物体内的病原菌,治疗剂在发病初 In the choice of fungicides to clarify the nature of fungicides. There are two types of fungicides, one is the protective agent, such fungicide is to prevent plant pathogenesis, such as Bordeaux mixture, mancozeb, carbendazim, etc .; the other is the therapeutic agent is applied after the onset of the plant In order to kill or inhibit pathogens invade the plant body, the therapeutic agent in the early onset