Ceratocystis fimbriata

Systematic position and pathogen nature: Ceratocystis fimbriata is a fungal pathogen belonging to the kingdom Fungi, phylum Ascomycota, and family Ceratocystidaceae. It is a highly aggressive fungus capable of infecting a wide variety of woody and herbaceous plants, leading to systemic vascular wilts and severe root rot diseases.

Diseases and host plants: This pathogen is best known for causing black rot in sweet potatoes. It also severely affects crops such as cacao, coffee, mango, citrus, eucalyptus, and poplars. In these hosts, it induces stem cankers, bark necrosis, and rapid wilting, which often results in the total death of the infected specimen.

Biology and life cycle: The fungus persists in the soil and on infected plant debris for extended periods. Its life cycle involves the production of three types of asexual spores: endoconidia, chlamydospores, and sexual ascospores formed within perithecia. Infection occurs primarily through mechanical wounds or natural openings on the plant surface.

Environmental conditions and spread: Favorable conditions for the pathogen include high humidity and temperatures between +20°C and +28°C. The spread of the fungus is facilitated by contaminated planting material, movement of soil, use of non-sterilized agricultural tools, and various insect vectors that transport spores to healthy tissues.

Economic impact and control: The economic damage is significant due to crop loss and the destruction of nursery stock. Effective management requires a combination of strategies:

• Utilizing disease-free, certified planting material.
• Implementing strict crop rotation and quarantine protocols.
• Sterilizing all pruning tools and equipment between operations.
• Prompt removal and destruction of infected plant material.
• Application of systemic fungicides as a preventative measure in high-risk areas.