of banana is one of the devastating diseases affecting the banana crop. It is caused
the conidial stage of
a fungus Mycospherella musicola. The disease is common in almost all districts of Bangladesh especially
in banana growing districts.
Initial symptoms of Sigatoka appear in the form of light yellowish spots on the leaves.
A small number of spots enlarge, become oval and the colour also changes to
dark brown. Still later, the centre of the spot dies, turning light grey
surrounded by a brown ring. In severe cases, numerous spots coalesce, killing
large parts of the leaf. Rainfall, dew and temperature determine the spread of
favouring mass infection are most common during the rainy season with high
temperatures (above 25°C) and high humidity. Closer spacing for getting higher
yield, especially when grown as single crop favours disease development. Fields
where drainage is poor are also more susceptible to the disease.
following integrated management practices could be used to minimize the
- Clean cultivation
- Use wider spacing
of diseased suckers
- Spray with propiconazole e.g. Tilt, or
mancozeb e.g. Dithane M-45 WP (in oil-water emulsion/ water only) as per label,
2-3 times at 15-day intervals
- Foliar spray of copper oxychloride (3g/litre
of water) or thiophanate methyl 1 g/ litre of water) also control the
- Soil treatment with triadimenol @ 0.75g a.i./plant every 4 months results in a complete
control of Sigatoka disease
When using a pesticide, always wear protective clothing and follow the instructions on the product label, such as dosage, timing of application, and pre-harvest interval.