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ThesisItem Restricted Estimation of residue of diafenthiuron in brinjal (Solanum melongena L.) and cabbage (Brassica oleracea L. var. capitata)(Punjab Agricultural University, Ludhiana, 2018) Athulya R.; Kang, B. K.Supervised field trials were conducted to study the residues of diafenthiuron in brinjal and cabbage following application @ 300 and 600 g a.i. ha-1. The samples of cabbage and brinjal were collected at 0 (2hrs), 1, 3, 5, 7 and 10 days after the second and third application. QuEChERS sample preparation was used for the determination of diafenthiuron residues. All the samples were quantified by High Performance Liquid Chromatography (HPLC) and confirmed by Liquid Chromatograph-Mass Spectrometry (LC-MS). Mean initial deposits of diafenthiuron at 300 and 600 g a.i. ha-1 on brinjal fruits were found to be 0.26 and 0.60 mg kg-1 reached below detectable level of 0.05 mg kg-1 after 5th and 7th day at single and double dosage, respectively. The average initial deposits of diafenthiuron in cabbage were observed to be 0.60 and 1.27 mg kg-1 following third application of diafenthiuron and reduced to below its limit of quantification of 0.05 mg kg-1 after 7 and 10 days at recommended and double the recommended dosages, respectively. Diafenthiuron residue in soil samples, collected from both brinjal and cabbage fields after third application was found to be below detectable level of 0.05 mg kg-1. The half-life value (T1/2) of diafenthiuron in brinjal was calculated to be 1.28 and 1.42 days and half -life in cabbage was 1.88 and 2.15 days at single and double the recommended dosages, respectively. The initial deposits were found to be below MRL of 1 mg kg-1, so one day waiting period is suggested for safe consumption of brinjal and cabbage. Among various household processing methods, cooking removed 100 percent of diafenthiuron residues on brinjal and cabbage in both the treatments.