Preliminary Study on The Control Method of Prunus Americanc Fruit Cracking Qianqian Ma, Wanyun Peng, Zhide Wang, Zhengwei Xie, Qiwei Wei and Yexing Sun E3S Web Conf., 131 (2019) 01103 Published online: 19 November 2019 DOI: 10.1051/e3sconf/201913101103