Author(s)

Xiaojun Chen, Ping Wang, Zhiyuan Meng, Si Chen, Haotian Gu, Xiaoling Sha

School of Horticulture and Plant Protection, Yangzhou University, Yangzhou, China.

To formulate a scientific basis for a reasonable spray dose and safe interval period of 20% flubendiamide water dispersible granule (WDG) on controlling vegetable pests, degradation dynamics of flubendiamide in cabbage and soil was analyzed in this study. Dissipation and residue of flubendiamide in 20% flubendiamide WDG in cabbage and soil under field conditions were investigated by liquid chromatography-tandem mass spectrometry with dispersive solid phase extraction. Results showed that the degradation dynamic equations of flubendiamide in cabbage and soil were based on the first-order reaction dynamic equations. The half-lives of the degradation of flubendiamide were 3.51 d to 3.96 d and 3.43 d to 3.87 d in the cabbage of Yangzhou and Jingzhou, respectively, and 4.42 d to 5.13 d and 4.37 d to 4.99 d in the soil of Yangzhou and Jingzhou, respectively. The terminal residues of flubendiamide in the cabbage of Yangzhou and Jingzhou were 0.0247 mg·kg^-1 to 0.0393 mg·kg^-1 and 0.0225 mg·kg^-1 to 0.0273 mg·kg^-1, respectively, when 20% flubendiamide WDG was applied at a dose of0.050g·m^-2. Flubendiamide is safe to be applied in cabbage fields at the recommended dose.

Flubendiamide, Dispersive Solid Phase Extraction, LC-MS/MS, Degradation, Residue

Chen, X. , Wang, P. , Meng, Z. , Chen, S. , Gu, H. and Sha, X. (2014) Degradation Dynamics and Residue Analysis of Flubendiamide in Cabbage and Soil by Liquid Chromatography-Tandem Mass Spectrometry with Dispersive Solid Phase Extraction. Agricultural Sciences, 5, 850-857. doi: 10.4236/as.2014.510091.