Inter-cropping with Ageratum conyzoides may effectively control major pathogens in citrus orchard. The research showed that flavones produced by and released from A. conyzoides could inhibit the major fungal pathogens,such as Elsimoe fawcetti Bit. Et Jenk, Collelotrichum gloeosporimdes Penz, Oidium tingitaninum Carter, Capondium citri Berk et Desm in citrus orchard. 10 flavones,including one glycoside,from A. conyzoides plant were isolated and identified. Most of them could gradually degraded in...