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Distribution of Emamectin Benzoate Granules in Maize Plants by Broadcasting into Maize Leaf Whorls

文献类型： 外文期刊

作者： Long, Yujun 1 ; Zhang, Haiyan 2 ; Liao, Guohui 2 ; Chen, Minggui 2 ; Chen, Xiangyan 2 ; Qin, Lixin 2 ; Chen, Caijun 1 ; Chen, Zhuo 3 ; Wu, Xiaomao 1 ; Zhu, Feng 2 ;

作者机构： 1.Guizhou Univ, Guizhou Key Lab Mt Agr Dis & Insect Pests, Guiyang 550025, Peoples R China

2.Guizhou Acad Agr Sci, Inst Plant Protect, Guizhou Ctr Pesticide Risk Monitoring, Guiyang 550006, Peoples R China

3.Guizhou Univ, State Key Lab Breeding Base Green Pesticide & Agr, Key Lab Green Pesticide & Agr Bioengn, Minist Educ, Guiyang 550025, Peoples R China

期刊名称：ACS OMEGA （ 影响因子：4.1； 五年影响因子：4.0 ）

ISSN： 2470-1343

年卷期： 2023 年

页码：

收录情况： SCI

摘要： Good control effects on fall armyworm (FAW) can be obtained by broadcasting emamectin benzoate (EB) granules into maize leaf whorls. However, the distribution of EB in maize plants is not clear. In this study, EB granules were prepared by the rotating granulation method, and the granules were characterized using a Fourier transform infrared spectrometer. The behavior of EB granules in water was observed using a microscope, and in vitro release of EB from granules was also studied. A method for the determination of EB in maize plants, old leaves, grains, and cobs was established by using ultra-performance liquid chromatography-tandem mass spectrometry. The results showed that EB was loaded in granules successfully, and the granules disintegrated slowly in water, so the release of granules could be regulated using various water contents. The prepared EB granules were qualified and stable. The field experiment showed that the concentration of EB in maize leaf whorls could be maintained above 0.23 mgmiddot kg-1 within 3 days after broadcasting EB granules. This ensured that FAW could be killed in a short time. Then, EB gradually transferred to the old leaves. After 21 days of application, the content of EB in the old leaves was 0.07 mgmiddotkg-1, which has long-time control effects on FAW. The control effects of the three doses of granules against Spodoptera frugiperda were higher than 78% after 14 days of application. At the tested dosage, no phytotoxicity to crops was observed. At harvest, neither the maize grain nor the cobs had EB content. New controlled formulations to S. frugiperda were developed and will be suitable for application in mountainous areas where the lack of water resources is a factor.

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