Pepper anthracnose

Colletotrichum capsici is a destructive fungal pathogen responsible for causing anthracnose in a wide variety of plants, particularly in the Solanaceae family. It is a highly specialized fungus that survives in soil, crop debris, and on seeds, waiting for favorable conditions to initiate an infection cycle on host plants.

The primary victims of this disease include bell peppers and chili peppers, although it is also known to affect tomatoes, eggplants, and various legumes. The pathogen can exist on weeds nearby, which often serve as primary sources of inoculum that can infect commercial fields throughout the growing season.

The visual symptoms of an infection typically manifest on mature fruits as circular, water-soaked, sunken lesions. As the disease progresses, these lesions turn dark brown or black and often develop concentric rings. Under humid conditions, orange or pink spore masses form within these spots, which are easily spread by water splashes and wind.

The development of Colletotrichum capsici is strictly driven by climatic conditions. The fungus thrives in warm temperatures ranging from 25°C to 30°C and requires high relative humidity or free moisture on the leaf and fruit surfaces. Heavy rainfall, overhead irrigation, and poor field drainage are significant factors that accelerate the rapid spread of the disease.

Economic damage caused by this pathogen is severe, as it directly ruins the quality of the harvested produce. Infected fruits are unmarketable, and in cases of heavy infestation, the entire crop can be lost. Furthermore, the persistence of the fungus in the soil makes it difficult to eradicate, necessitating long-term management strategies.

Effective control and prevention require a combination of cultural and chemical strategies. Growers should prioritize the use of disease-free seeds and resistant varieties. Integrated Pest Management (IPM) practices, including the removal of infected plant debris, adequate spacing for better air circulation, and the timely application of systemic and contact fungicides, are crucial to mitigate the risks associated with this destructive fungus.