Evaluation of insecticides against Coriander aphid and estimation of residues
2011
Meena, Radhe Shyam | Gupta, H.C.L. | Sharma, R.P.
LC50 values of imidacloprid, profenofos, ethion, thiomethoxam, dimethoate, malathion and endosulfan were found to be 0.01646, 1.17892, 1.16890, 1.01642, 1.26798, 1.13530 and 1.04456%, respectively. Results revealed the highest toxicity of imidacloprid while dimethoate showed the low toxicity. Microbioassay residue film method using one day old male, Drosophila melonogaster was used for detection of micro quantities of residue of imidacloprid in coriander leaves and seeds. It was possible to detect as low as 0.005 µg of imidacloprid present in the sample by this technique. More than 85% recovery of these insecticides was obtained from fortified samples of leaves and seeds of coriander. Spray application of imidacloprid @ 160 ml a.i./ha resulted in the deposits 4.2778 ppm on leaves and 2.8655 ppm on seed, which dissipated almost 100% in 15 days from leaves and 13 days from seeds. The half life values could be estimated as 2.37 days on leaves and 2.19 days on seed. The waiting period after last spray was worked out to be 4.97 days for leaves and 3.32 for seeds.
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