Banana Yellow Sigatoka:Mycospharella musicola
- Initially, appearance of pale yellow or greenish streaks parallel to the veins on the upper surface of the leaves
- Then these streaks darken and become more or less elliptical brown spots.
- Later on, the centre of these spots turns to light grey colour surrounded by yellow halo
- The spots often coalesce to form large irregular patches of dried tissue
- Rapid drying and defoliation of leaves are the characteristic features of this disease
- Normally 15-18 leaves are necessary at the time of shooting for bunch development, but due to Sigatoka leaf spot it is difficult to maintain 15 leaves
- In severe cases, immature bunches fail to fill out
- The fingers of bunch in affected plants tend to remain undersized and angular but pulp starts ripening
Identification of pathogen:
- This disease is caused by Mycospharella musicola
- The conidiophores bear conidia. Which is obclavate and multiseptate
- Perithecia are dark brown to black, erumpent, ostiolate
- Asci are oblong, clavate. Ascopores are one septate, hyaline, obtuse-ellipsoid with upper cell slightly broader
- The conidia of the fungus are carried by the wind, rain water and old dried infected leaves and they help to spread the disease
- This disease is common on poor, badly drained soils and in shady areas
Closer spacing, heavy weed or grass
- cover, frequent irrigations and failure to remove suckers that favour the build of the disease.
- Removal and destruction of affected leaves.
- Keep the banana field as weed free and remove the suckers timely.
- Avoid planting at close spacing.
- Provide proper drainage and avoid water logging in the fields which favour infection.
- Spray Bordeaux mixture 1 percent + linseed oil 2 percent on the plants
- Spray Copper oxychloride or zineb with gas oil or mobile oil or white oil
- Spray 3 times with Carbendazim 0.1 per cent or Propicanozole 0.1 % or Mancozeb 0.25% or Calixin 0.1% and teepol (sticking agent) at 10-15 days interval, as the disease starting from the initial appearance of leaf specks on the lower side of the leaf.
- TamilNadu Agritech Portal