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Deltamethrin insecticide was highly toxic to mammals and had long-term residual effects and easily causing environmental pollution. The dependence concentration of deltamethrin (25 ppm) was used to treat unripe mandarin orange fruits through a field experiment. A daily and weekly fruit samples, up to 35 days, were examined for deltamethrin residues. The concentrations of deltamethrin which immigrated via peel into flesh of mandarin orange were 3.4, 3.9, 4.5 and 5.2 ppm after 1, 2, 3 and 4 daysdoi:10.36103/ijas.v49i6.154 fatcat:g7tf2zxjqncr7m6xrxuyiprury