Migration of Dicloran during Bagging Planting of Honey Pomelo

The content of dicloran in bagging paper and honey pomelo was determined by gas chromatography-tandem mass spectrometry. Meanwhile, the migration of dicloran from five kinds of bagging paper to different parts of honey pomelo was studied through field experiments. The results showed that the residual concentration of dicloran in honey pomelo treated with four kinds of bagging paper with dicloran gradually increased with the prolongation of bagging time, and reached the maximum value on the 40th day. When the normal harvest of whole honey pomelo on the 70th day, the correlation between the final residual concentration of dicloran in whole honey pomelo and the initial content of dicloran in bagging paper was in line with the prediction equation: y=-0.048×e^(-x/26.156) +0.048. The initial critical content of dicloran in bagging paper was 6.126 mg/kg when the final residual concentration of dicloran in whole honey pomelo was 0.01 mg/kg. No dicloran was detected in the pulp of all pomelos during bagging process. By picking bags 10 days in advance, the residues of dicloran in whole honey pomelo could be reduced by 23.8%.This study provides a scientific basis for revealing the source of residual pollution of dicloran in honey pomelo, and has important guiding significance for pomelo bagging cultivation, bagging paper production and management in the future.