Abstract

Application of certain organophosphatic insecticides viz., fenthion, phosphamidon, monocrotophos, dimethoate, fenitrothion, phosalone chlorpyriphos, methyl parathion, dichlorvos and quinalphos to rice (var: IR 20) at 0.05 per cent concentration 20, 35 and 50 days after transplanting had not left any residues (45 days after the last spray) in the hand pounded rice. The dissipation of fonthion and dichlorvos was found total as neither the hand pounded rice nor the bran and straw contained any amount of residues. Although some of them had left residues in bran and straw, they were found well below the tolerance levels. The study has suggested that all the insecticides tried in this investigation could be safely used for the protection of rice crop it used 45 days before harvest,

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