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A rapid technical methodology of determining pesticide utilization rate in field was established by the Pesticide Application Technol-ogy Research Group

 

Recently, the Pesticide Application Technology Research Group from IPP-CAAS has published a paper titled “Water-soluble food dye of Allura Red as a tracer to deter-mine the spray deposition of pesticide on target crops” on Pest Management Science.

In this paper, water-soluble dye Allura Red was applied to simulate a pesticide, and water only was utilized for the extraction procedure from the target crop. An envi-ronmentally friendly and rapid method for determination of pesticide utilization rate was established (Fig. 1).Since 2007, Pesticide Application Technology Research Group has been committed to the determination of pesticide utilization rate methods, measuring and comparing the performance, advantages and disadvantages of different tracers. According to the research results, Allura Red was chosen as the best tracer for determining pesticide deposition utilization rate. Allura Red has the following advantages: (1) Pesticide al-ternatives: Allura Red and pesticides showed comparable deposition under the same application conditions with ratios from 0.98 to 1.21; (2) Stability: the degradationrates of Allura Red were 0.34%, 3.32%, and 4.53% at pH 4, 7, and 9, respectively, indi-cating that Allura Red is relatively hydrolytically stable. The photolytic rate constant (k) is 0.006 h?1, and the photolysis half-life (t1/2) of Allura Red is 116 h, which clearly demonstrates that Allura Red is photostable under normal solar irradiation; (3) Ac-curacy and precision of the methods for Allura Red were found to be satisfactory with recoveries of 95.87% to 106.158% on filter paper or crops. In addition, as a food additive, Allura Red also has the advantages of low toxicity, moderate cost and bright color that differentiates it from target crops.

This work was accomplished by IPP-CAAS, and the project was funded by the Na-tional Key Research and Development Program (2016YFD0200703).

More details can be found on the link below:
https://onlinelibrary.wiley.com/doi/pdf/10.1002/ps.5430

By Yan xiaojing (yanxiaojing@caas.cn)

Fig. 1 Allura Red as a tracer to determine pesticide deposition


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