Residual Behavior of Various Insecticides on and in Lemons and Oranges1

Abstract

Magnitudes and persistence of chlordane, dieldrin, and heptachlor residues on and in lemons, and of malathion residues on and in Valencia oranges, are recorded. Persistence half-life values of these insecticides in the peel of the fruit are 19, 60, 23, and 32 days, respectively. Only negligible apparent residues were found in the edible portion of the fruit.