Controlling anthracnose by means of extracts, and their major constituents, from Taub.

Anthracnose, caused by the fungus (Penz.) Penz. & Sacc., is the most limiting fungal disease of mango and papaya crops in Colombia. The and activity against of the extracts from sawdust of Taub. (Moraceae) was evaluated. The extracts of less polarity (-hexane and dichloromethane) displayed the greatest inhibitory effects. Then, the coumarins xanthyletin (2.74 % d.w.) and 7-demethylsuberosin (2.19 % d.w.) were isolated from these extracts. The compound 7-demethylsuberosin displayed a strong and antifungal activity. Furthermore, the metabolism of 7-demethylsuberosin by the fungus was analyzed. The fungus slowly detoxified 7-demethylsuberosin to marmesin and decursinol. Therefore, the high antifungal activity and low level of detoxification make 7-demethylsuberosin, and the extracts that contain it, promising candidates for controlling . Sawdust of may be considered a valuable source of extracts and coumarins with antifungal activity.