Abstract
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.
Highlights
Flubendiamide is an inhibitor of ryanodine receptor that was developed by the Japanese Pesticide Corporation, Ltd. and first registered in the Philippines in 2007 [1] [2]
The results showed no obvious improvement in the recovery of flubendiamide with increased amounts of Primary secondary amine (PSA) and C18
The results showed that the degradation dynamic equations of flubendiamide in the cabbage were based on the first-order reaction dynamic equations, and 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 (Table 2)
Summary
Flubendiamide is an inhibitor of ryanodine receptor that was developed by the Japanese Pesticide Corporation, Ltd. and first registered in the Philippines in 2007 [1] [2]. Flubendiamide is mainly effective for controlling lepidopteron pests, including resistant strains in vegetables, fruits, rice, and cotton. This insecticide has good, rapid, and long-term activity against both adults and larvae. Flubendiamide is a new phthalic amide insecticide that has a function in the activation mechanism of intracellular calcium release channels (ryanodine receptors), a leading cause of uncontrolled storage of calcium release. The 20% flubendiamide water dispersible granule (WDG) is registered for controlling vegetable insects, such as Spodoptera exigua or Plutella xylostella, in China. Flubendiamide WDG is used to control rice pests. Reports on the detection and analysis methods of flubendiamide focus on the analysis of flubendiamide using HPLC-UV (UV-visible detector) and liquid chromatography-tandem mass spectrometry (LC-MS/MS) ion switching in the ESI position mode [7]-[14]
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