Studies on persistence of fenazaquin and spirotetramat in chilli and soil.
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Date
2022
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Punjab Agricultural University, Ludhiana
Abstract
Trials were conducted for two years for studying the dissipation and persistence of fenazaquin and spirotetramat in chilli and soil following application of Fenazaquin 10 EC @ 125, 156.25 and 250 g a.i. ha-1 and Spirotetramat 15.31 OD @ 60, 75 and 120 g a.i. ha-1. The limit of quantification (LOQ) and (LOD) were 0.01 and 0.003 mg kg-1. The residues of fenazaquin dissipated more than 90 per cent in 20 and 10 days in green chilli and soil, respectively at recommended dose. The residues of spirotetramat and its metabolites reached below the LOQ after 15 and 3 days in green chilli and soil, respectively at the recommended dose. Waiting period was calculated to be 3, 5 and 8 days for green chilli after application of fenazaquin at the 125, 156.25 and 250 g a.i. ha1 . One day waiting period is estimated after treatment of green chilli with spirotetramat at the three doses. The processing factor for fenazaquin residues in red chilli after dehydration was estimated to be 2.08 at recommended dose for both the years. Dipping of chilli fruits in baking soda (5%) and boiling proved effective in reducing the residues of fenazaquin and spirotetramat. The activity of the amylase, invertase, acidic phosphatase was not affected by these pesticides while the dehydrogenase activity was reduced. The activity of the alkaline phosphatase and urease was affected after the application of fenazaquin and spirotetramat.
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Himani (2022). Studies on persistence of fenazaquin and spirotetramat in chilli and soil (Unpublished M.Sc. thesis). Punjab Agricultural University, Ludhiana, Punjab, India.