Comparative Pathological Activity of Two Isolates of Colletotrichum gloeosporioides (PENZ.) On Two Mango Varieties ( Mangifera indica L.)

The anthracnose, caused by fungi is the second major obstacle in mangoes production and exportation in Cote d’Ivoire. This study has been done to evaluate the pathogenicity of two isolates Bo and Ko of Colletotrichum gloeosporioides (Penz.), an agent responsible for anthracnose in mango fruits. Fungi isolates were obtained from Brooks (Bo) and Kent (Ko) mango varieties and cultivated in pure PDA medium. Some fruits from Brooks and Keit varieties were inoculated with fungi mycelium discs on both previously wounded and unwounded fruits. The inoculated fruits were monitored for 14 days and dates of lesion occurrence and expansion on fruit were recorded with time. Results revealed that both isolates did not cause any lesion on both varieties with the unwounded technique on the 9th day. However, when inoculation was preceded by a wound on the fruit, some lesions were observed with Brooks and Keit varieties, on the 7th day after inoculation. The length of lesion induced on Keit variety by Ko isolates (1.09 ± 0.08 cm) and Bo (0.19 ± 0.11 cm) differed significantly on the 7th day. No significant differences in lesion rate induced with the Ko isolates (100 %) and Bo (80 to 85 %) from the 9th day. Besides, Ko shows itself the most virulent. This work revealed that Colletotrichum gloeosporioides (Penz.) was a pathogen capable of deteriorating mango fruit quality after harvest, with a more serious impact when the wound occurred before fungi infection.