| Abstract
| - The decay rate of six insecticides (azinphos methyl, diazinon,dimethoate, methidathion, parathionmethyl, and quinalphos) used to control Dacus oleae wasstudied. Degradation of pesticides showedpseudo-first-order kinetics with correlation coefficients rangingbetween −0.936 and −0.998 andhalf-lives between 4.3 days for dimethoate and 10.5 days formethidathion. Residues in olive oilwere greater than on olives, with a maximum concentration factor of 7.Dimethoate was the onlypesticide with lower residues in the oil than on the fruits. Olivewashing affects pesticide residuesranging from no reduction to a 45% decrease. During 8 months ofstorage of the olive oil, diazinon,dimethoate, parathion methyl, and quinalphos did not show anyremarkable difference, whilemethidathion and azinphos methyl showed a moderatedecrease. Keywords: Residues; insecticides; olives; olive oil; storage;washing
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