Abstract

A field investigation was carried out in the main research farm at department of vegetable science, Lovely Professional University Phagwara, Punjab in the year of 2024 to 2025 to determine the dissipation pattern of synthetic insecticides on leaves using reversed-phase high-performance liquid chromatography (RPHPLC) (Shimadzu), fully equipped with a refractive index (RI) and photodiode array (PDA) detector and their impact on the quality characteristics of brinjal. The study included different insecticidal treatments applied at recommended dosages: T₀ (Control), T₁ (Cartap hydrochloride 50% SP at 500 grams (g) a.i./ hectare (ha)), T₂ (Chlorpyrifos 20% EC at 200 g a.i./ha), T₃ (Deltamethrin 2.8% EC at 15 g a.i./ha). The experiment was performed using a randomized block design with three replications. The highest initial deposits (1.91 mg/kg) were found in treatment T₂, followed by treatment T₁ and T₃ (1.62 mg/kg and 1.17 mg/kg), respectively. The treatment T₃ degraded rapidly within 7 days as compared to other treatments. The dissipation rates for different pesticides were observed as T₁ was 33.66% after one day which was increased to 96.58% on tenth day, similarly for T₂ and T₃ the initial dissipation was 31.70% and 42.35% which increased to 97.04% and 93.11% on 12^th and 7^th day of application. Analysis of data revealed that the application of different treatments found a non-significant effect on quality characteristics of brinjal fruit. The maximum total soluble solids (TSS) (3.79 ^°Brix), titratable acidity (0.58%), crude protein (1.76%), and chlorophyll content (44.27%) was found in T₀, compared to other treatments. The findings concluded that insecticides applied at recommended dosages degraded within 7 – 15 days intervals from leaves of brinjal and found negligible impact on quality characteristics of brinjal.

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