Colletotrichum pseudoacutatum

Pathogen and disease type. Colletotrichum pseudoacutatum is a fungal pathogen responsible for causing anthracnose, a severe disease that impacts various plant species. As a member of the Colletotrichum genus, it is known for its aggressive colonization of plant tissues. This fungus is highly effective at surviving in crop residues and soil, ensuring long-term persistence in agricultural environments.

Susceptible crops. This pathogen exhibits a broad host range, posing a significant threat to many horticultural and agricultural crops. It is particularly damaging to strawberry, blueberry, raspberry, and various citrus species. Because it can infect roots, stems, leaves, and fruits, the pathogen disrupts the plant's physiological functions at multiple stages of its lifecycle.

Symptoms and signs. Typical symptoms include sunken, dark-colored lesions on fruits, leaves, and stems. As the infection progresses, these lesions often develop a characteristic gelatinous mass of conidia, which may appear pinkish or cream-colored under humid conditions. In severe cases, the infected tissue becomes necrotic, leading to leaf drop and fruit rot.

Conditions for development and severity. The fungus thrives in warm, humid conditions, with temperatures ranging from 20°C to 28°C being optimal for spore germination and infection. Rain splashes, contaminated irrigation water, and contaminated tools act as primary vectors for spreading the spores throughout a field. The economic impact is high, as the infection can lead to massive fruit loss and quality degradation.

• Removal and destruction of infected plant material.
• Use of certified, disease-free planting stock.
• Implementing drip irrigation to reduce surface moisture.
• Application of appropriate broad-spectrum fungicides.

Control and prevention measures. Integrated pest management (IPM) is essential for controlling this fungus. Prevention starts with selecting resistant cultivars and maintaining strict field sanitation to minimize inoculum pressure. During the growing season, a well-timed fungicide program, combined with proper canopy management and ventilation, is critical to suppress the disease and ensure a healthy harvest.