The present studies were carried out under protected cultivation at CSK Himachal Pradesh Krishi Vishvavidyalaya, Palampur. Single spray of three insecticides viz., imidacloprid (0.018%), indoxacarb (0.015%) and lambda-cyhalothrin (0.004%) was given on tomato crop. The residues of imidacloprid and indoxacarb were worked out on tomato fruits during winter season 2015 whereas lambda-cyhalothrin residues were worked out during summer season 2016. Tomato fruit samples were collected at 0, 1, 3, 5, 7 and 10 days after application of insecticides. The residues were analyzed using High Performance Liquid Chromatography. The initial deposits of imidacloprid, indoxacarb and lambda-cyhalothrin on tomato fruits were 0.643, 0.401 and 0.550 mg/kg, respectively. The residues of all the insecticides were below detectable limits on 10 th day of application. The half-life values of imidacloprid, indoxacarb and lambda-cyhalothrin were 2.91, 5.26 and 3.06 days, respectively. The corresponding safety intervals were worked out to be 0.36, 0.46 and 1.03 days for imidacloprid, indoxacarb and lambda-cyhalothrin.

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