How to save the tree from the disease

Question

Mausam singh · Answer

coconut of all age are liable to be attacked but normally young coconut are more susceptible, particularly during monsoon when the temperature is low and humidity is very high. In seedlings, the spear leaf turns pale and comes off with a gentle pull.

The earlier symptom is the yellowing of one or two younger leaves. Black spots appear on spindle leaves.  Basal tissues of the leaf rots quickly and can be easily separated from the crown.
In the later stages the spindle withers and drops down. 
The tender leaf base and soft tissues of the crown will rot into a slimy mass of decayed material emitting foul smell. 
Ultimately the entire crown falls down and the palm dies

In adult coconut, the first visible symptom is the colour change of the spear, which becomes pale and breaks at the base and hangs down. The rotting slowly progresses downwards, finally affecting the meristem and killing the palms. This is accompanied by drooping of successive leaves. Even then, nuts that are retained on the coconut may grow to maturity.

Management
Chemical Method:

Remove all the affected tissue of the crown region and crown drenching with Copper oxychloride 0.25%. (Apply Bordeaux paste and protect it from rain till normal shoot emerges. (Dissolve 100 gm of copper sulphate and 100 gm of quick lime each in 500ml. water separately and mix to form 1 litre of Bordeaux paste).
Spray 0.25% Copper oxychloride on the crown of the neighbouring palms as a prophylactic measure before the onset of monsoon. (Spray 1% Bordeaux mixture on spindle leaves and crown of disease affected as well as neighbouring palms, as a prophylactic measure. Palms that are sensitive (Dwarf palms) to copper containing fungicides can be protected by mancozeb. Small, perforated sachets containing 2 g of mancozeb may be tied to the top of leaf axil. When it rains, a small quantity of the fungicide is released from the sachets to the leaf base, thus protecting the coconut.
The infected tissues from the crown region should be removed and dressed with Bordeaux paste sprayed with 1% Bordeaux mixture as pre-monsoon spray (May and September).
Leaf axil filling with Sevidol 8G, 25 g mixed with 200g sand is recommended to red palm weevil infestation of affected palms.
Spray with Copper oxychloride 0.25% after the onset of Monsoon.
Cultural Method:

Provide adequate drainage in gardens.
Adopt proper spacing and avoid over crowding in bud rot prone gardens.