Department of Agricultural Entomology, Faculty of Agriculture, Bidhan Chandra Krishi Viswavidyalaya Mohanpur, Nadia - 741 252, West Bengal, India.
Field studies conducted with three insecticide viz, quinalphos, methomyl and alpha-cypermethrin at their recommended and double the recommended dosages to detect residues in grain and straw at harvest revealed that no residues could be detected in harvested paddy irrespective of treatments and insecticides. Methomyl dissipated at faster rate in comparison to quinalphos. Both quinalphos and methomyl reached BDL 15 days after final spraying in grain and straw. On the other hand alpha-cypermethrin reached BDL 21 days after final spraying.
