... plant organization, the utilization ratio of boron is 70-80%, the symptoms of lack of boron ... has good antiseptic and disinfectant , pesticide, and is also effect to prevention of powdery mildew,-----,it ... plant organization, the utilization ratio of boron is 70-80%, the symptoms of lack of boron ... good antiseptic and disinfectant , pesticide, and is also effect to prevention of powdery mildew,-----,it ...