To investigate dynamics of Pseudosymmachia flavescens adults and explore trapping effects of sugar-acetic acid-ethanol-water solution(SAEWS)on P.flavescens in walnut orchard,orthogonal test was used to optimize the best formula of the SAEWS,and the dynamics of P.fllavescens was monitored by using SAEWS with three formulas at four trap-hanging heights in walnut orchard of Zhen'an county Shangluo city,Shaanxi province in 2020-2022.The results showed that the optimum composition of SAEWS was sugar 3 g,acetic acid 4 mL,ethyl alcohol 3 mL and water 20 mL.The occurrence period of P.flavescens adults is from early-May to mid-September in walnut orchards,and the emergency peak period is from mid-June to mid-July.The trapping amount of SAEWS significantly increased with increasing height from 0.5 m to 1.5 m,and then decreased at 2.0 m height.In addition,570 P.flavescens adults were trapped all the year by SAEWS at 1.5 m height above ground,accounting for 50.04％,which was significantly higher than that at other hanging heights.The results indicated that SAEWS(3∶4∶3∶20,m:V∶V∶V)could not only be used to accurately monitor the population dynamics of P.fllavescens,but also served as an efficient control method.
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