Colletotrichum tainanense

Colletotrichum tainanense is a fungal pathogen belonging to the Colletotrichum genus, primarily known for causing anthracnose disease. It is a member of the Colletotrichum gloeosporioides species complex, which makes it a significant concern for global agricultural production. This pathogen is highly adaptable and can compromise plant health at various developmental stages.

This fungus exhibits a broad host range, primarily infecting tropical and subtropical fruit crops such as mango, papaya, and avocado. It can also affect various vegetables and berries. The fungus typically invades the host through epidermal wounds or directly through the cuticle, initiating a destructive colonization of the plant tissues.

Visible symptoms include the development of sunken, dark-colored lesions on leaves, stems, and fruit. Under high humidity conditions, the fungus produces masses of conidia in acervuli, which appear as orange or pinkish gelatinous droplets. If left untreated, these lesions enlarge rapidly, leading to fruit rot and premature fruit drop.

Environmental conditions play a critical role in the epidemiology of this disease. The fungus thrives in warm, humid environments, especially during rainy seasons. High relative humidity and temperatures between 20°C and 30°C favor the germination of spores and the secondary spread of the infection through water splashes and wind-borne conidia.

Effective management requires a multi-faceted approach to reduce the inoculum load and protect the crop. Key control measures include:

• Implementing strict field sanitation to remove infected plant debris.
• Using fungicides, including strobilurins and triazoles, according to regional recommendations.
• Applying pre-harvest and post-harvest treatments to preserve fruit quality.
• Cultivating resistant or tolerant plant varieties in highly infested areas.