Effect of Aviation Spray Adjuvants on Physicochemical Properties and Efficacy of 2.5% Jinggangmycin·Bacillus cereus AS in Controlling Rice Sheath Blight Using a UAV Sprayer
Journal Title: Journal of Shenyang Agricultural University - Year 2025, Vol 56, Issue 1
Abstract
[Objective]Through the study of physicochemical properties and control effect of 2.5% Jinggangmycin·Bacillus cereus (JG·BC) for rice sheath blight, the suitable aviation spray adjuvants were screened for 2.5% JG·BC AS. [Methods]Mix the test ageut with the recommended amount of 40 mL·667 m-2 in the field and 1 000 mL·667 m-2 for drone spraging to prepare aspray solution for the determination of relevant indicators. [Results]The results showed that while eight commercial aviation spray adjuvants were mixed with JG·BC according to 0.5%, 1.0%, 1.5% or 2% of the pesticide solution volume, respectively, aviation spray adjuvants did not destroy the stability of the pesticide solutions and could significantly reduce the surface tension, contact angle and wetting time of the pesticide solutions. When 2.0% MD and EOA were added, the surface tension of the solutions decreased by 51.00% and 47.65%, the wetting time decreased from more than 500.0 s to 2.7 s and 1.9 s, and the solution droplets expanded rapidly when they first touched the leaf surface, and then, the contact angle of droplets was close to 0 °，and the evaporation rate of pesticide solutions decreased by 36.70% and 31.33%, respectively. The viscosity of the solution increased by 370.97% and 19.35% respectively by 2.0% MD and 2.0% EOA. The coverage rate, deposition density and deposition amount of spray droplets in the upper rice leaves were significantly higher than those on the middle and lower leaves, and those on the lower was the least. On the same layer leaves, the coverage rate,deposition density and deposition amount of spray droplets with adjuvants were significantly higher than those without adjuvants.[Conclusion]The control effect of 2.5% JG·BC AS with 2.0% MD and 2.0% EOA against rice sheath blight was 90.97% and 89.30%, respectively, which was significantly higher than that without adjuvants.
Authors and Affiliations
QI Zhiqiu, GAO Lianqi, LI Yi, WEI Songhong
Keywords
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- EP ID EP764956
- DOI DOI:10.3969/j.issn.1000-1700.2025.01.003
- Views 16
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