Mango lophodermium blight

Causal agent and disease type
Mango lophodermium blight is a fungal infection caused by the ascomycete Lophodermium mangiferae. This disease specifically targets the foliage of mango trees. It is characterized as a leaf spot disease that typically manifests during the maturation phase of the leaves, affecting the plant's photosynthetic efficiency.

Affected crops
The primary host for Lophodermium mangiferae is the mango tree (Mangifera indica). It is a widespread issue in tropical mango-growing regions across the globe. While the fungus is often opportunistic, it can cause significant aesthetic and physiological damage to both commercial orchard varieties and wild mango species.

Symptoms and signs of infection
Initial symptoms appear as dark brown to black spots on the leaf blades, often surrounded by a chlorotic halo. A definitive diagnostic feature is the emergence of black, elongated apothecia (fruiting bodies) within the lesions. As the infection progresses, leaves may become necrotic and drop prematurely, which disrupts the tree's canopy density and overall health.

Conditions for development and spread
The pathogen thrives in high-humidity environments where leaf surfaces remain wet for extended periods. Spores are disseminated primarily through wind and water splashes during rainfall events. Orchards with poor canopy management, high planting density, and limited airflow are at significantly higher risk of a severe outbreak of the disease.

Harmfulness and control measures
The damage caused by this blight leads to reduced fruit yield due to defoliation and weakened tree physiology. To effectively manage and mitigate the impact of the disease, growers should follow these recommendations:

• Practice regular canopy thinning to ensure proper airflow and light penetration.
• Sanitize the orchard floor by collecting and destroying fallen infected leaves.
• Apply preventative copper-based fungicides when environmental conditions favor disease development.
• Avoid over-irrigation that creates persistent high-humidity conditions around the canopy.