Axonopus anthracnose

The disease is caused by the phytopathogenic fungus Colletotrichum axonopodis. As an ascomycete fungus, it acts as a significant threat to various plant species, particularly those within the grasses family. It thrives by colonizing the plant tissues, leading to cell death and the disruption of normal physiological processes.

The host range of Colletotrichum axonopodis primarily involves plants of the genus Axonopus, although it can occasionally infect other agricultural and ornamental species. Its ability to colonize different hosts makes it a persistent issue in regions where the environment supports high humidity and warm temperatures throughout the growing season.

Symptomatology involves the appearance of leaf spots, lesions on stems, and sometimes rot on inflorescences. Initially, these symptoms appear as small, water-soaked dots, which eventually darken and develop into necrotic spots with characteristic borders. Under high humidity, the fungal pathogen produces spores, often visible as dark acervuli, which serve as inoculum for secondary infections.

Disease development is heavily influenced by environmental conditions, especially moisture and temperature. The fungus spreads via rain splashes, wind, and movement of contaminated soil or plant debris. Because the pathogen can persist on dormant vegetation or in the soil, it is capable of causing repeated outbreaks if not properly managed through sound agricultural practices.

Effective management requires an integrated approach to minimize the impact of Colletotrichum axonopodis. Preventive measures focus on reducing the primary inoculum source through field sanitation and crop rotation. In cases of severe infection, chemical control using systemic or contact fungicides is essential to protect the canopy and preserve yield quality.