Polyphenol Content and Enhancing Plant resistance of Lowland Arabica Coffee Distiana Wulanjari, Ketut Anom Wijaya, Muhammad Ghufron Rosyady and Ali Wafa E3S Web Conf., 142 (2020) 01006 Published online: 21 January 2020 DOI: 10.1051/e3sconf/202014201006