Abstract

The persistant effect of the insecticides and fungicides on S. oryzae was studied for a period of five months by introduction of adults of S. oryzae at the commencement of the experiment and subsequently at monthly intervals. Among the three insecticidal seed treatments, malathion and HCH were significantly supcrior to activated kaolin in effecting the mortality of the weevil pest over a storage period of five months. Among the three fungicidal seed treatments, thiram and carbendazim + thiram were significantly better than carbendazim in causing mortality of S. oryzae. The standard treatment DDT+thiram was found to be superior to the other treatments in causing greater mortality of S. oryzae by its persistant effect.

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