YELLOW SIGATOKA (Sigatoka Leaf Spot):
Symptoms:
In India, it is caused by Cercospora musae (C.musae), the asexual form of Mycosphaerella fijiensis.
- Symptoms start as tiny, yellow broken streaks followed by the development of brown spindle shape lesions in the streaked areas with a yellowish halo.
- Slowly lesions darken and become elliptical brown spots with a grayish centre demarcated by a well defined brown or black border.
- These lesions coalesce and enlarge causing death of leaf blade.
- This results in reduced photosynthetic area and eventually reduced harvestable yield coupled with accelerated fruit maturity and immature ripening.
Control Measures:
- Keep the orchard clean, remove the diseased leaves and burn outside the plantation.
- Make proper drainage of water to avoid water logging.
- Contact fungicide Mancozeb(2.5gm / lt) or Calixin (2ml/lt) with Teepol (Sticking agent ) must be sprayed during initial symptoms.
- During severe infection Bavistin @ 2gm / lt or 0.1% Tilt can also be used and repeat at 15 days interval.
- Increment in Potassium in the fertilizer dose and 6 feet X 6 feet spacing in plantation minimizes the infestation.
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