To calculate the biological half-life during pre-harvest and post-harvest of Chlorothalonil and Carbendazim which are used as chemicals to control the dieback(Pestalotia diospyri SYOOW) of ginger. 1,000-fold dilution of TANPROTM(Carbendazim and Chlorothalonil suspension concentrate) treated twice in the cultivation. Pre-harvest samples were sampled 10 times from 2hours later(day 0), day 1, 2, 3, 5, 7, 10, 15, 20, 25 after the treatment. Post-harvest samples were cured in the condition of 30oc and 95% humidity for 3 days after the harvest and stored in the condition of 13oc and 95% humidity. Then, sampled 7 times in days 0, 1, 4, 7, 14, 25 for 3 times repeatly. To extract pesticide residue, used Grinder(Bliex 3, France) and Homogenizer(Kinematica PT-3100, Swiss). To analyze the residue of Chlorothalonil, GC/ECD(HP6890, USA) was used. For Carbendazim, UPLC/PDA(Waters Acquity, USA) was used as equipment to analyze the residue. Found expotential regression equation for change of pesticide residue by using stat program(SigmaPlot 12.5) then calculated half-life. In the result of calculating half-life of Chlorothalonil and Carbendazim residue from pre-harvest and post-harvest of ginger, Carbendazim's half-life in pre-harvest (41.0 days) was shown shorter than in post-harvest (69.3 days). The reason is estimated that content of Carbendazim decrease fast in pre-harvest because of ultraviolet degradation, hydrolysis and hypertrophic growth. In the contrast, Chlorothalonil's half-life in pre-harvest (364.8 days) was shown longer than in post-harvest (29.9 days). It's because degradation or metabolism of Chlorothalonil active more on the post-harvest condition. Enhanced research is thought to be needed in the future. 

Residual patterns of pesticides in ginger (<i>Zingiber officinale</i>): Chlorothalonil, carbendazim during pre�harvest, post�harvest

248th National Meeting (2014)

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Residual patterns of pesticides in ginger (Zingiber officinale): Chlorothalonil, carbendazim during pre�harvest, post�harvest