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VOL. 8, ISSUE 3 (2026)
Insecticide-Residue indicator Drop (i-RID): A capillary-based approach for rapid on-site screening of insecticide residues in brinjal
Authors
Susmitha S, Yasodha P, Sheeba Joyce Roseleen S, Sabarinathan K
Abstract
The indicator-based residue detection (i-RID) technique was evaluated
on brinjal fruits treated with eight insecticides: carbofuran 3 G,
chlorpyriphos 20 EC, dimethoate 30 EC, fipronil 5 SC, profenofos 50 EC,
spiromesifen 22.9 SC, thiamethoxam 25 WG and triazophos 40 EC. The capillary
rise of the i-RID on the treated fruits was compared with that on untreated
control fruits at successive days after treatment (DAT). On the day of spray,
the i-RID spread wider on treated fruits than on controls. The drop was
colourless at 1 DAT and turned distinctly red on later days, when the
surfactants no longer reduced surface tension and the drop's spread returned to
normal. The time taken for the drop to cover the microslides differed
significantly between treated and control fruits at 1 DAT for every insecticide
tested. Treated fruits ranged from 15.12 ± 0.58 min (spiromesifen) to 16.48 ±
0.79 min (thiamethoxam), against controls of 13.22 to 15.30 min. Most
treatments then showed no significant difference from the control. Exceptions
were carbofuran at 10 DAT, chlorpyriphos at 5 DAT, dimethoate at 3 DAT,
spiromesifen at 2 DAT, and triazophos, which differed at 1, 3, 7 and 10 DAT.
For carbofuran, chlorpyriphos, dimethoate, spiromesifen and thiamethoxam, the
difference was significant only at 1 DAT and the first few days afterwards. The
difference was strongest in the first days after application, when the
surfactant load on the fruit surface was highest, and it disappeared as the
residues weathered. The i-RID can therefore give a quick, low-cost indication
of recent insecticide application on brinjal fruits, mainly within the first
days after spraying.
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Pages:533-537
How to cite this article:
Susmitha S, Yasodha P, Sheeba Joyce Roseleen S, Sabarinathan K "Insecticide-Residue indicator Drop (i-RID): A capillary-based approach for rapid on-site screening of insecticide residues in brinjal". International Journal of Agriculture and Plant Science, Vol 8, Issue 3, 2026, Pages 533-537
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