Black Sigatoka Pathology and Management in Banana Cultivation

Black Sigatoka, or black leaf streak disease, is caused by the fungus Pseudocercospora fijiensis and ranks among the most destructive foliar diseases of banana worldwide. The pathogen exhibits a hemibiotrophic lifestyle, colonising leaf tissue initially without visible symptoms before switching to a necrotrophic phase that causes chlorotic and necrotic streaks, leading to reduced photosynthetic capacity and premature leaf senescence. Warm, humid conditions and intensive production systems favour rapid spore germination, dissemination by wind and rain splash, and successive infection cycles. Management hinges on an integrated strategy combining chemical, cultural and genetic measures. Frequent fungicide applications remain the mainstay of control, but selection for resistant strains of the fungus and environmental concerns drive interest in alternative approaches. Cultural practices such as leaf pruning, optimized irrigation and canopy management reduce inoculum load and microclimate favouring disease. Breeding and biotechnological interventions seek to introduce durable resistance from wild Musa germplasm into commercial cultivars, while advances in pathogen genomics, effector biology and host immune signalling inform the design of targeted interventions. Modelling of disease pressure under current and future climate scenarios underlines the global threat to banana production and guides region-specific management programmes.

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Technical terms

Hemibiotrophic: Lifecycle with an initial biotrophic phase followed by a necrotrophic phase.

Effector: Secreted pathogen-derived molecule that modulates host cell function to promote infection.

Transcriptome: Complete set of expressed RNA transcripts in a cell or organism under specific conditions.

Hypersensitive response: Localised programmed cell death around infection sites as a plant defence.

Germplasm: Genetic resource material, such as seeds or tissue, used for breeding and conservation.

Area Under the Disease Progress Curve (AUDPC): Quantitative measure of disease intensity over time, used to compare resistance levels.

References

1. Pseudocercospora fijiensis Conidial Germination Is Dominated by Pathogenicity Factors and Effectors. Journal of Fungi (2023).
2. Genetic Improvement for Resistance to Black Sigatoka in Bananas: A Systematic Review. Frontiers in Plant Science (2021).
3. Black Sigatoka in bananas: Ecoclimatic suitability and disease pressure assessments. PLOS ONE (2019).