Harvest Time Residue Analysis of Azoxystrobin in Potato Srinivasan V.M.*, Krishnamoorthy A.S. Department of Plant Pathology, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu *Email: vmagri@rediffmail.com
Online published on 2 January, 2017. Abstract Azoxystrobin grouped under strobilurin clad has been reported to have broad spectrum of activity against several plant pathogens. It is absorbed through the roots and translocated in the xylem to the stems and leaves or through leaf surfaces to the leaf tips and growing edges. In the present study azoxystrobin was sprayed at different concentration viz., 250 ml ha−1 (62.5 g a.i ha−1), 500 ml ha1 (125 g a.i ha−1), 750 ml ha−1 (187.5 g a.i ha−1) and 1000 ml ha−1 (250 g a.i ha−1) on potato against late blight disease. In each treatment, 500 g of potato tuber samples and soil samples were collected at the time of harvest for residue analysis. GCMS analysis of azoxystrobin standard showed the retention time of 11.65 min in all the concentrations. Potato tubers and soil samples collected from the control plots were artificially applied with azoxystrobin standard at 0.1, 0.3 and 0.5 ppm for the estimation of recovery percentage. The estimated recovery of azoxystrobin from potato tuber was 99.90, 99.20 and 99.00 per cent. Whereas, in the field soil 98.44, 99.50, 98.26 per cent recovery noticed at 0.1, 0.3 and 0.5 ppm respectively. The harvest time residue of azoxystrobin on potato tuber and soil of respective fields were analyzed and found that azoxystrobin was below detectable level (BDL) in all the samples (tuber and soil) collected at the time of harvest. Top Keywords Azoxystrobin, Potato, Residue analysis, Harvest time, Late blight. Top |