Spatial Distribution and Abamectin Emulsifiable Control Effect of Cyammophila Willieti
In 2021,a survey was conducted on the population of Cyammophila willieti in the Styphnolobium japonicum for-est at the Forestry Station of Shanxi Agricultural University Forestry College.The spatial distribution aggregation index was used to determine the distribution characteristics of Cyammophila willieti on Styphnolobium japonicum,and the control effect of different concentrations of avermectin emulsion on Cyammophila willieti was studied.The results showed that the spatial distribution of Cyammophila willieti in the Styphnolobium japonicum forest was clustered,and it also exhibited clustered dis-tribution in 4 directions of Styphnolobium japonicum.According to the average aggregation index,the aggregation of Cyam-mophila willieti in the study area was due to its own habits or a combination of its own habits and environmental factors,while the aggregation in different directions was caused by environmental factors.Abamectin emulsifiable had a good control effect on locust bean psyllid.The control effect of 2 000 fold solution was significantly higher than that of 3 000 fold solu-tion,and there was no significant difference in the control effect between 1 000 fold solution and 2 000 fold solution.The population reduction rate of both can reach over 96％.
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