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Introduction Grape, an important fruit crop of India, is affected by thrips that is a destructive sucking insect of grapevine. Imidacloprid, a neonicotinoid insecticide, gives very good control of this insect.

Objectives Study of the residue persistence of imidacloprid on grapes, to estimate its residue deposit, half‐life of degradation, safe pre‐harvest interval and harvest time residues for consumption of this fruit after its multiple applications.

Methods Extraction with acetonitrile, partitioning into dichloromethane, clean up with neutral alumina and estimation of residues with high‐pressure liquid chromatography, using a UV‐VIS detector at wavelength of 270 nm.

Results Initial residue deposit of imidacloprid on grape berries following treatment of Confidor 200 SL at the recommended and double the recommended dose of 80 and 160 g a.i. ha⁻¹ were 0.74 and 1.26 mg kg⁻¹, respectively. Residues remained …