乐必耕是美国陶氏益农公司研究开发的一种嘧啶类新型杀菌剂.具有内吸杀菌作用,兼有预防和治疗双重作用.药剂通过干扰病原菌甾酸及毒角甾醇的形成而影响菌丝的生长发育,抑制病原菌菌丝的伸长,阻止已发芽的病菌孢子侵入作物组织.在病菌潜伏期施用,能阻止病原菌的发育;而在发病后 Le Bigeng is a novel pyrimidine fungicide researched and developed by Dow AgroSciences Company in the United States, which has the function of systemic bacteriostasis and dual functions of prevention and treatment. The medicament affects bacteria by interfering with the formation of pathogenic steroid acids and cortisol Silk growth and development, inhibit the growth of pathogenic mycelial spores, sprouting germs to prevent the invasion of crop tissue in the incubation period of the bacteria can prevent the development of pathogens; and after the onset