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‘Dashehari’ mangoes from Lucknow region of Uttar Pradesh, India are popular in domestic as well as international markets. Paclobutrazol, a plant growth regulator, has been successfully used on a commercial scale in soil application to counter the alternate bearing habit of mango all over the country. The persistence of paclobutrazol residues in soil and its subsequent uptake in mango leaves and fruits were studied using high performance liquid chromatography after its application to tree basin soil of mango cv. Dashehari @ 0.8 and 1.6 g a.i. tree⁻¹. The residues of paclobutrazol dissipated in soil from its initial values of 3.51 and 7.04 to 0.01 and 0.03 mg kg⁻¹ after 300 days of application from normal and higher concentrations, respectively. The rate of dissipation in soil followed first order kinetics with half life values of 41.5 and 43.0 days from normal and double doses, respectively. Initially paclobutrazol …