Residues of acephate, amitraz, chlorpyrifos and formetanate hydrochloride on and in fruits after low‐volume applications to orange trees

摘要

AbstractAcephate, amitraz, chlorpyrifos and formetanate hydrochloride were applied to orange trees. Test plots were treated at the maximum dose rates currently permitted in California in order to determine the consequent residues on and in the fruits. Applications were made with a low‐volume airblast sprayer and used 0.94 klitres of spray per hectare. Fruit samples were collected at or near the legally prescribed California fruit‐harvest waiting intervals. All residues were below the US tolerances for whole fruit. Analytical procedures for the gas chromatographic analysis of intact amitraz and formetanate and of 2,4‐xylidine residues, without the necessity for derivative formation, are pres