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Rotting and excessive shedding of immature nuts from the trees
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The water soaked spots initially develop at the base of the nut. Fruit stalks and rachis of inflorescence are also affected
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Nuts show large vacuoles and dark brown radial strands
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Very often the top of the affected trees dries up resulting in withering of leaves and bunches
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Affected nuts fall off and show the white mycelial growth of the fungus
Dept of Agriculture Development 
SFAC Kerala