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Tissue Culture Banana Cultivation Technology
Fungal Disease (Pre
& Post Harvest) – Brown spot or Diamond Spot:
Symptoms:
The
disease is caused by Cercospora hayi often in conjunction
with Fusarium
spp. These
fungi are common saprophyte (fungal organisms which obtain nutrients from dead
organic matter) on banana leaf trash and on senescent (aged, from full maturity
phase to death) weed leaves. Spores are produced on the dead leaves and are
released onto fruits even at very low wind velocities.
Cercospora
hayi causes black, sunken, diamond shaped lesions on the
harvesting grade fruits. Inconspicuous
spots may become prominent lesions during shipping and ripening. The first
symptom caused by this fungus is slightly raised yellow spots, 3 – 5 mm in
diameter on the green peel. Fusarium
sp. and Cercospora hayi inoculated together extend the initial yellow
lesions into the typical diamond shape lesions. The infected cells fail to
expand as the fruit grows and a longitudinal crack surrounded by a yellow halo
develops resembling a diamond shaped lesion.
 |
| Brown spot or Diamond Spot disease in Banana fruit |
Control:
- Regular removal of drying and decaying leaves including bracts especially during rainy season.
- Using Polythene bunch cover is found to be effective.
- Spray or dip the raw or harvested hands with 0.05% Bavistin or 0.01% Tilt or 0.25% Indofil M45 at 15 days interval.
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