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Copyright of Food & Fermentation Industries is the property of Food & Fermentation Industries and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

【Objective】The effects of operation parameters of multi-rotor plant protection unmanned aerial vehicle (UAV) at different growth stages of maize on deposition quality and the control efficacy of Spodoptera frugiperda were compared to select the optimal operation parameters, with an aim to provide scientific basis for precise pesticide application of S. frugiperda. 【Method】DJI T20 six-rotor plant protection UAV was used as the research object, the operation parameters including flight altitude, flight speed and nozzle type were tested for optimization of deposition distribution at the trumpet stage and heading stage of maize, and the population decline rate and control effect of S. frugiperda 7 d after the application of pesticides were investigated.【Result】At trumpet stage of maize, when a SX110015VS nozzle operated at a flight speed of 4 m/s and at a flight altitude of 2.5 m above the maize canopy, the maximum normalized average droplet deposition was 0.45 μL/cm2 . When a SX110015VS nozzle operated at a flight speed of 4 m/s and a flight altitude of 1.5 m, both average droplet coverage and average droplet density were the highest, which were 44.92 drops/cm2 and 9.31%, respectively. At heading stage of maize, the normalized average droplet deposition, average droplet coverage and average droplet density were the highest when a SX110015VS nozzle operated at a flight speed of 4 m/s and a flight altitude of 2.5 m, which were 0.50 μL/cm2, 82.92 drops/cm2 and 7.67%, respectively.【Conclusion】The actual occurrence level of pests should be taken into consideration in the selection of operation parameters at trumpet stage and heading stage of maize. The highest droplet deposition was achieved when the UAV flew at a speed of 4 m/s, an altitude of 2.5 m and a nozzle type of SX110015VS, the corrected control efficiency was more than 85% after 7 days of application. [ABSTRACT FROM AUTHOR]

Copyright of Food & Fermentation Industries is the property of Food & Fermentation Industries and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Modern Food Science & Technology is the property of Editorial Office of Modern Food Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

A residual analysis method for mefentrifluconazole in banana and mango was established using ultra high performance liquid chromatography tandem mass spectrometry (UPLC-MS/MS) detection technology. The field trial was conducted in banana and mango at six sites during one year according to NY/T 788-2018 the "Guideline for the Testing of Pesticide Residues in Crops" to study the degradation dynamics and residual distribution of mefentrifluconazole. After the application of the formulation of mefentrifluconazole 400 g/L suspension concentration (SC) on banana and mango crops, fruit samples were extracted with acetonitrile, purified with combined adsorbents of GCB and C18, and analyzed by UPLC-MS/MS. The results showed that at four spiked levels of 0.001-1 mg/kg, the average recovery of mefentrifluconazole in whole banana and flesh was 83%-93% with the relative standard deviation (RSD) 2.3% to 5.9%, and the average recovery of mefentrifluconazole in whole mango and flesh was 82%-91% with the RSD 2.9% to 6.0%, respectively; and the limit of quantification (LOQ) was 0.001 mg/kg. The field trials in banana showed that, under the condition of applying mefentrifluconazole 400 g/L SC at dosage of 133.3 mg/kg for 3 times with application interval of 7-10 days, the residues of mefentrifluconazole at 21 and 28 days after the last application were 0.03-0.09 mg/kg in whole banana and <0.001-0.004 mg/kg in the flesh. In the field trials of mango, under the condition of applying mefentrifluconazole 400 g/L SC at dosage of 160 mg/kg for 3 times with application interval of 7-10 days, residues of mefentrifluconazole were 0.04-0.28 mg/kg in whole mango and 0.001-0.003 mg/kg in the flesh at 14 and 21 days after the last application. The research results can provide a reference for guiding the scientific and rational use of mefentrifluconazole in banana and mango, as well as for the establishment of its maximum residue limit (MRL) values. [ABSTRACT FROM AUTHOR]