Dissipation and persistence of indoxacarb and thiamethoxam in chilli
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Date
2021
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Punjab Agricultural University, Ludhiana
Abstract
Supervised field trials were conducted for two consecutive years to study the residues of
indoxacarb and thiamethoxam in chilli, following two foliar applications of Indoxacarb 14.5
SC @ 55 and 110 g a.i. ha-1 and seed treatment of Thiamethoxam 30 FS @ 2.1 and 4.2 g a.i.
ha-1. The chilli fruit samples were collected at different time intervals and were processed by
following QuEChERS methodology and determination of indoxacarb and thiamethoxam
residues were done by Gas Liquid Chromatography (GLC) and Gas Chromatography-Mass
Spectrometry (GC-MS/MS). The average initial deposits of indoxacarbon green chilli fruits
were found to be 2.75 and 5.93 mg kg-1 while 2.56 and 5.68 mg kg-1 respectively, in year 2019
and 2020, that reached below its limit of quantification (0.01 mg kg-1) after 25 and 35 days at
single and double dose, respectively. The mean residues of thiamethoxam in seedlings, green
chilli fruits and red chilli fruits were observed to be below its limit of quantification (0.05 mg
kg-1). The half-life value of indoxacarb in green chilli was calculated to be 3.46-4.77 and
3.58-3.76 days while 3.85 and 4.93 days in soil, respectively at single and double the
recommended dose. Household processing methods were studied for reduction of residues of
indoxacarb in chilli and it was observed that boiling found most effective (71.27-78.75%)
followed by acetic acid + washing (70.74-74.73%), followed by sodium chloride + washing
(60.06-75.75%) and baking soda + washing (61.22-74.91%). Sun drying of red chilli fruits
resulted in increase in the residues of indoxacarb by 1.58-2.10 folds and thiamethoxam
residues by 2.62-2.83 folds.
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Citation
Harpreet Kaur (2021). Dissipation and persistence of indoxacarb and thiamethoxam in chilli (Unpublished M.Sc. thesis). Punjab Agricultural University, Ludhiana, Punjab, India.