Residues on olives,oil and processing waste waters of pesticides used for the control ofDacus oleae (Gmel.) (Dipt., Tephritidae)

A study has been carried out on the presence of pesticide residues (deltamethrin, fenthion, formothion and their metabolites) on olives, oil and processing waste waters, after adulticide and larvicide treatments for the control ofDacus oleae (Gmel.). Deltamethrin was found to have a faster degradation rate than fenthion, leaving no traces on olives 18 days after treatment. Fenthion, on the contrary, was still present on the drupes at harvest (28 days after the treatment). Formothion was not found in definable quantities 3 days after treatment, while its metabolities, dimethoate and omethoate, were found on olives at harvest in levels of 4–23 ppb.