Dissipation Kinetics of Azoxystrobin on Chilli under Field Conditions

Results of supervised field trials conducted under four different agro climatic locations of India to evaluate the persistence and dissipation pattern of azoxystrobin on chilli, are reported. Azoxystrobin 25 SC was applied at the recommended (125 g a.i. ha⁻¹) and double the recommended (250 g a.i. ha⁻¹) doses, samples of green chilli drawn at different time intervals and that of red chilli and soil at harvest time. The residues were quantified using high performance liquid chromatograph coupled with UV-Vis detector. LOQ of the method was found to be 0.1 mg kg⁻¹. Azoxystrobin dissipation followed first order kinetics with half-lives of 1.84–2.15 and 2.21–2.79 d, for 125 and 250 g a.i. ha⁻¹ doses respectively. Residues of azoxystrobin were found below its determination limit of 0.1 mg kg⁻¹ in red chilli and soil at harvest. Azoxystrobin fungicide residues in fruit were below the EU maximum residue limit (MRL, 3 mg kg⁻¹) just after treatment.