Dissipation of β-Cyfluthrin and Imidacloprid as Combination Product in/on Mango (Magnifera indica L.)

A field experiment was conducted during 2009–10 at Anand Agricultural University, Anand (Gujarat) to study the dissipation of β-cyfluthrin and imidacloprid in/on mango. Three sprays of a ready mix formulation; β-cyfluthrin 9% + imidacloprid 21% were carried out at 10 d intervals starting from the button stage @ 0.025 & 0.05%. Residue analysis of raw mango revealed initial deposits of 0.10 and 0.11 μg g⁻¹ for β-cyfluthrin and imidacloprid, respectively,at standard dose of application. The corresponding levels at higher dose were 0.17 and and 0.23 μg g⁻¹. The residues of β-cyfluthrin dissipated at relatively faster rate and reached below determination limit on 3^rd d whereas imidacloprid residues though short lived attained the below determination limit on 7^th d at standard dose of application. Residues of either insecticide were below determination levels in ripe mango. Soil samples when analysed at harvest showed residues at below determination level for both the insecticides.