1Department of Agricultural Entomology, Kerala Agricultural University, Thiruvananthapuram, 695522, Kerala, India
Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore, 641003, Tamil Nadu, India
*Email: bankakishorereddy@gmail.com (corresponding author)
Online Published on 6 February, 2023.
A field experiment was conducted to study the rate of dissipation of thiamethoxam 25% WG in vegetable cowpea. Thiamethoxam 25%WG @ 0.24 ml l-1 was sprayed at pod formation stage, and samples of pods were harvested at 0 (2 hr after spray), 1, 3, 5, 7, 10, 15 days after spray. Residues were estimated using liquid chromatography tandem mass spectrometer (LC-MS/MS) at the All-India Network Project on Pesticides Residues, College of Agriculture, Vellayani, Kerala. The mean initial residue was found to be 0.53 µg g-1, and residues were observed persisting up to three days and reached below quantification level on fifth day.
Dissipation, Thiamethoxam, Cowpea, Food safety, LC-MS/MS, Linearity, Recovery, Risk assessment, Limit of detection
