Vol. 10, Issue 10 (2021)

Author(s):
SS Monica, B Vinothkumar, SV Krishnamoorthy and L Rajendran

Abstract:
Field trial was conducted to study the harvest time residues of chlorantraniliprole and cyantraniliprole on potato variety Kufri Jyoti at farmers' holdings in Kukkal village, Kotagiri, (11. 46°N 76. 88°E and 1,847 MSL) Nilgiris District, Tamil Nadu, during the summer season of 2021. At the time of harvest, samples are collected. The tubers were sliced into small pieces in the lab, and a sub sample of around 500 g was taken and homogenised using a high-speed mixer grinder. In UHPLC, the parameters of specificity, linearity, LOD, LOQ, recovery, and repeatability were used to validate the analytical technique. A good linearity was obtained with a correlation coefficient (R²) of 0. 999 for both chlorantraniliprole and cyantraniliprole. On potato, the LOD and LOQ values for chlorantraniliprole were 0. 021 and 0. 070 μg g^-1, respectively, while cyantraniliprole was 0. 003 and 0. 011 μg g^-1. Chlorantraniliprole 18. 5 SC @ 30 g a. i. ha^-1 and cyantraniliprole 10. 26 OD @ 75 g a. i. ha^-1 residues were found to be below detectable levels in potato tubers collected from the treatment plots at harvest time.