Nature of damage:
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•Triangular pale or yellow patches close to perianth.
•Necrotic tissues.
•Brown colour patches, longitudinal fissures and splits on the husk. Oozing of the gummy exudation from the affected surface. Reduced size and copra content. Malformed nuts with cracks and hardened husk.
Management
•Apply urea 1.3 kg, super phosphate 2.0 kg and muriate of potash 3.5 kg/palm/year.
•Neem cake @ 5 kg and organic manure 50 kg/palm/ year. Borax 50 g + gypsum 1.0kg + Manganese sulphate 0.5 kg/palm/ year.
•Grow intercrop (sun hemp, four crops/year) and shelter belt with casuarina all round the coconut garden to check further entry.
•Triazophos 40 EC 5 ml/lit or carbosulfan 25 EC 2 ml/ lit in alternation with Neem azal 1% 5ml/lit as spot application.
•Root feeding : Root feeding with TNAU - Agro Biocide 30 ml/tree. TNAU - Agro biocide - 30 ml/tree - (60 days after Carbosulfan root feeding).Triazophos 40 EC @15 ml or carbosulfan 25EC @ 15 ml / 15 ml of water. After root feeding, next harvest should be done 45 days later. Pluck nuts before root feeding .