Lembosia leaf spot

Lembosia leaf spot is a fungal disease caused by the ascomycete fungus Lembosia coccolobae. It is a specific pathogen known to affect various species of the Coccoloba genus, most notably the sea grape (Coccoloba uvifera) in coastal and tropical climates.

The fungus is categorized as a leaf-spotting pathogen. It thrives by colonizing the leaf tissue, which eventually interferes with the plant’s ability to photosynthesize effectively. While usually not fatal to mature, healthy trees, it significantly degrades the ornamental value and vigor of the plants.

The primary symptom of the disease is the appearance of dark, circular, or irregular spots on the upper leaf surface. Over time, these lesions host the fungus's dark, crust-like fruiting bodies (thyriothecia), which appear as small black specks or lines scattered across the affected leaf areas.

Environmental conditions play a critical role in the development and spread of Lembosia coccolobae. High humidity, heavy rainfall, and poor air circulation are the primary drivers of infection. The fungal spores are typically disseminated through water splashing, wind, and contact with contaminated tools.

Effective management requires a combination of sanitation and chemical intervention. Removing infected leaves promptly helps lower the inoculum load in the garden. Applying appropriate copper-based fungicides during the rainy season or periods of high humidity is recommended to protect new leaf growth.

• Prune and destroy infected plant parts.
• Improve air circulation around plant canopies.
• Apply fungicide sprays during high-risk seasons.
• Disinfect garden tools to prevent cross-contamination.