Anthracnose

The disease is caused by the pathogenic fungus Colletotrichum jacksonii, which is a member of the Ascomycota division. This organism is responsible for anthracnose, a severe plant pathology that damages both cultivated crops and native plant species across various regions.

Target hosts for this pathogen primarily include legumes and certain woody ornamental plants. The fungus thrives by infecting various plant parts, specifically stems, foliage, and fruit, leading to significant physiological stress and economic loss for agricultural producers.

Clinical signs of infection manifest as depressed, necrotic lesions on the surface of plant tissues, typically appearing dark brown or black in color. As the infection progresses, acervuli—specialized structures bearing spores—erupt through the epidermis, often exhibiting a distinctive salmon or pink-colored mass under high moisture conditions.

The proliferation and spread of Colletotrichum jacksonii are heavily dictated by environmental factors, particularly humidity levels exceeding 85% and frequent rainfall events. The pathogen is disseminated primarily through splash-dispersed conidia, which move between plants via wind-driven rain or human-assisted movement of tools and equipment.

Mitigation of this disease requires a rigorous preventative approach focusing on cultural and chemical strategies. Agronomists recommend removing primary inoculum sources from the field after harvest, selecting resistant plant varieties, and utilizing timely applications of approved fungicides when environmental conditions favor disease onset.