Mycosphaerella fijiensis

Black sigatoka disease

General

Mycosphaerella fijiensis also known as black sigatoka, is an ascomycete fungus that causes leaf-spot of banana.

Life cycle and appearance of Black sigatoka disease

Black sigatoka (Mycosphaerella fijiensis) produces both ascospores and conidia. The ascospores are wind-dispersed over longer distances, the conidia are splash-dispersed within the crop. Both types of spores cause the exact same symptoms. They enter the leaf through the stomata. After infection, hyphae emerge from the stomata and either develop into conidiophores with new conidia or grow across the surface and infect adjacent stomata. Both types of spores can germinate within two or three hours under humid conditions, but infection takes a minimum of two or three days under optimal conditions (humidity close to saturation and temperature above 20 °C).

How to control Black sigatoka disease

How to prevent Black sigatoka disease

  • Use resistant cultivars
  • Remove or burn infected leaves or at least stack them, so the spores cannot be discharged from the lower leaves in the stack
  • Use under-canopy (drip) irrigation to reduce splash dispersal
  • Lower the humidity as much as possible by preventing the occurrence of puddles and ensuring optimal ventilation in the crop

Prevent plant diseases by optimizing plant potential and crop resilience.