Epicoccum spot

Epicoccum spot is a plant disease caused by the fungus Epicoccum purpurascens (often identified as Epicoccum nigrum). While primarily a saprophyte found on dead organic matter, this fungus acts as an opportunistic pathogen that can infect various crops under stress, including legumes such as chickpeas, as well as several vegetable species.

The primary symptom is the appearance of distinct spots on leaves, stems, and seed pods. These lesions often start as yellowish or brownish spots, eventually developing a characteristic purple or dark brown margin. Under high humidity conditions, a vibrant orange, red, or brown spore mass develops on the surface of the lesions, which is a diagnostic feature of this specific fungal infection.

The disease thrives in warm and humid climates, with optimal infection occurring between +20°C and +25°C. Moisture is a critical factor for the dispersal of spores from plant debris or soil to healthy tissue. Consequently, periods of frequent rainfall or prolonged morning dew during the growing season significantly increase the likelihood of an outbreak in the field.

In terms of economic impact, the disease impairs the plant's photosynthetic capacity by causing premature leaf senescence. In chickpeas, the infection of pods can lead to deformed seeds and reduced seed viability. Severe infestations may cause significant losses in crop yield and grain quality, making control measures necessary in high-risk zones.

Management and prevention strategies focus on reducing inoculum and improving plant health:

• Selection of disease-free, high-quality seeds for planting.
• Use of chemical seed treatments to prevent early seedling infection.
• Crop rotation, avoiding back-to-back sowing of susceptible legume species.
• Effective residue management, including deep plowing to bury infected plant material.
• Applying preventive fungicide sprays if weather conditions favor disease development during the flowering or pod-filling stages.