Anthracnose of Euphorbia

Anthracnose of Euphorbia is a fungal disease caused by Colletotrichum euphorbiae, a plant pathogen known for its ability to damage various plant tissues. It thrives by penetrating the host's cuticle, eventually leading to localized tissue necrosis and plant decline.

The primary hosts of this pathogen are plants belonging to the Euphorbiaceae family. This includes various species of Euphorbia, which are widely utilized in both ornamental gardening and commercial plant production sectors globally.

The disease typically presents as dark, sunken lesions on stems, leaves, and leaf stalks. As the fungus colonizes the plant, these spots expand, often turning dark brown or black. Under humid conditions, visible fungal fruiting bodies appear on the surface of the lesions as small, cushion-like structures.

Development and spread of Colletotrichum euphorbiae are significantly accelerated by high humidity and temperatures ranging from 20 to 25°C. The pathogen survives in infected plant debris or in the soil, spreading via water splashes, rainfall, or contaminated gardening tools.

Integrated management is essential for control. Recommended practices include:

• Removing and destroying infected plant parts immediately.
• Ensuring proper spacing to improve air circulation.
• Avoiding overhead irrigation to keep foliage dry.
• Applying systemic or contact fungicides as a preventative measure during high-risk seasons.