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Environ Monit Assess. 2013 Dec;185(12):10473-7. doi: 10.1007/s10661-013-3345-6. Epub 2013 Jul 24.

Dissipation, residues, and risk assessment of spirodiclofen in citrus.

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Plant protection research institute Guangdong academy of agricultural sciences, Guangdong Provincial Key Laboratory of High Technology for Plant Protection, Guangzhou, 510640, People's Republic of China.


The dissipation, residues, and distribution of spirodiclofen, a new type of insecticide and acaricide that belongs to the class of ketoenols or tetronic acids, in citrus were investigated in this study. Risk assessment of sprodiclofen was also conducted based on those data. The open-field experiments were conducted in Guangdong, Fujian, and Guangxi of China. Results showed that the half-lives in citrus ranged from 6.5 to 13.6 days at three sites. The terminal residues of spirodiclofen were all below the FAO/WHO maximum residue limit of 0.5 mg/kg in citrus, when they were determined 14 days after final application. Distribution of spirodiclofen in peel and flesh was analyzed, and residues were found to be concentrated on peel. Risk assessment was performed by calculation of risk quotient, which showed that the use of spirodiclofen is comparably safe for humans.

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