The residue levels of trichlorfon, fenthion and its metabolites were determined in olives, olive oil and vegetation water after treatment of olive trees at different times before harvest. The highest residues of fenthion were detected in oil, while the highest level of trichlorfon was found in vegetation water. The time gap between treatment and harvest strongly influences the residue levels of fenthion in olives and olive products. The levels of fenthion, which were lower than the maximum residue level (MRL) established by the Italian regulations, were obtained only when the treatment was carried out 60 days before harvest, so it may be necessary to use the insecticide trichlorfon 30 or 10 days before harvest since it leaves low residue levels in oils.

Residues of fenthion and trichlorofon in olives and olive oil after olive tree treatments

The effects of treatment with dimethoate against Dacus oleae (Gmel.), using two different doses, have been monitored. A reverse correlation between fly activity and pesticide residues has been pointed out. Decrease of dimethoate residue has been faster for trees treated with low dosage; in this case a limited control of the parasite has been detected. No phytotoxic effects has been founded on cv. Coratina

Sull'impiego del dimetoato nel controllo di Dacus oleae (Gmel.) : il problema del residuo dell'olio di oliva

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Sull'impiego del dimetoato nel controllo di Dacus oleae (Gmel.) : il problema del residuo dell'olio di oliva