Colletotrichum brisbanense

The fungus Colletotrichum brisbanense is a known pathogen responsible for anthracnose disease in a variety of plant species. As an ascomycete fungus, it employs an efficient reproductive strategy to infect host tissues, often leading to rapid colonization and significant necrotic damage in diverse environmental settings.

This pathogen demonstrates a wide host range, primarily affecting tropical and subtropical crops, including avocado, mango, and various ornamental species. It infects all aerial parts of the plant, including leaves, stems, flowers, and fruits, which makes it a significant concern for both commercial orchards and greenhouse production.

Key symptoms and diagnostic signs include:

• The emergence of sunken, dark-colored lesions on fruits and leaf surfaces.
• Development of gelatinous spore masses, which appear pinkish or orange in humid conditions.
• Premature leaf abscission and stem dieback due to severe infection.
• Rapid fruit decay and tissue softening, significantly reducing the shelf life of produce.

Environmental factors play a crucial role in the development of Colletotrichum brisbanense. High humidity levels, frequent rainfall, and warm temperatures between 22°C and 28°C create an ideal environment for spore germination and colonization. The pathogen persists in soil, plant debris, and on weed hosts, facilitating its spread during favorable weather conditions through water splash and wind.

Management and protection strategies require an integrated approach. Effective methods include the removal and destruction of infected plant debris to reduce the inoculum level, improving air circulation within the canopy, and the strategic application of fungicides. Preventive treatments during the flowering and fruit-set stages are particularly critical to minimize the incidence of anthracnose outbreaks in susceptible crops.