Citrus cryptosporiopsis

The causative agent of this disease is the fungus Cryptosporiopsis citri. It is a pathogenic fungus that specifically targets citrus varieties, causing necrotic lesions on the fruit surface and occasionally on twigs. As a fungal disease, it poses a recurring challenge to citrus production in susceptible regions.

Host plants primarily include various species of the genus Citrus. Sweet oranges, lemons, and mandarins are the most frequently affected. The pathogen is opportunistic, often infecting the fruit while it is still developing or during the ripening phase when the tissue is most vulnerable.

The main symptoms include the appearance of small, depressed, brown to dark-colored lesions on the fruit peel. As the infection progresses, these spots expand, leading to tissue decay and potential secondary rot. In humid conditions, the pathogen may develop visible spore structures on the affected areas.

Environmental conditions such as high humidity, frequent rainfall, and moderate temperatures are ideal for the development of Cryptosporiopsis citri. The fungus spreads through rain splashes, wind, and contaminated pruning tools. Moist environments allow spores to germinate rapidly on the fruit skin.

The economic impact of the disease is significant, as it leads to high rates of fruit loss and spoilage, rendering the harvest unsuitable for commercial sale. Infected fruit often deteriorate rapidly during storage and transportation, which drastically reduces post-harvest shelf life.

Integrated disease management strategies include:

• Sanitary pruning of infected branches to reduce inoculum sources.
• Prompt removal and disposal of all fallen and symptomatic fruit.
• Application of copper-based fungicides during high-risk rainy seasons.
• Improving canopy airflow through strategic thinning.
• Sterilization of pruning tools to prevent cross-contamination between trees.