Persistence of quinalphos in/on chilli and cropped soil

Studies on the dissipation of quinalphos in/on chilli were undertaken by following two applications at an interval of 10 days starting at fruit initiation stage. Two doses of quinalphos at recommended (250 g a.i ha⁻¹) and double the recommended dose (500 g a.i ha⁻¹) were evaluated for residues. The results revealed that in case of quinalphos 25 EC@250 and 500g a.i ha⁻¹, the initial residues were 0.96 mg kg⁻¹ and 1.83 mg kg⁻¹ and were found to be below detection limit(BDL) on 7^th and 10^th day, respectively. The residues of quinalphos were found to be below detection limit (BDL) in soil at harvest. The residual half life values recorded were1.99 and 2.07 days, respectively. The Pre-Harvest Interval (PHI) of seven days can be suggested for quinalphos for residue free chilli.