Bark disease of coffee

Bark disease of coffee is a significant fungal disorder that attacks the stems and branches of coffee plants. The causative agent is the fungus Fusarium stilboides, which primarily targets the bark tissues, leading to lesions that can eventually compromise the structural integrity and vascular function of the tree.

The disease primarily impacts Arabica coffee (Coffea arabica) and Robusta coffee (Coffea canephora). These crops are susceptible to the pathogen, especially when they are grown under stress or in conditions that favor the proliferation of fungal spores across the plantation canopy.

The most common symptoms include cracking of the bark, the formation of open lesions or cankers, and the subsequent dieback of branches. If the infection reaches the main trunk, the tree may show signs of wilting and reduced vigor. Often, a visible fungal growth appears on the surface of the affected bark as the tissue dies.

Conditions that facilitate the development and spread of bark disease include high humidity, heavy rainfall, and existing mechanical damage to the tree bark. The spores can be easily disseminated through contaminated tools, rain splashes, and wind, making it crucial to manage the plantation environment to prevent rapid outbreaks.

Effective management strategies are essential to minimize economic losses.

• regular inspection of trees for early signs of bark cracking;
• strict sanitation practices during pruning and harvesting;
• immediate removal and disposal of infected plant material;
• use of fungicide treatments as part of an integrated pest management program.