Prevention Effectiveness of 24%Drop Acid Clopyralid and 24%Picloram on Mikania micrantha in Sanxiang Town
To inhibit the growth and spread of Mikania micrantha,this study was conducted for two con-secutive years(2021-2022)to implement the control of M.micrantha in Sanxiang town of Zhongshan city by combining artificial clearance and chemical control.24%drop acid clopyralid or 24%picloram was selected as a chemical control agent to spray M.micrantha before the flowering period of each year and was continuously trea-ted for three months.At least three times agent spraying was carried out during the period,meanwhile,manual removal was used in areas unsuitable for spraying.After the prevention and treatment,the residual rate and re-currence rate were investigated.The results showed that the residual rate of M.micrantha was controlled below 0.3%and the recurrence rate was controlled below 0.2%and below in the control area of 74.3 hm2 and 34.6 hm2 of the prevention task.The control M.micrantha had achieved remarkable results,and the effect of 24%picloram on M.micrantha was equivalent to that of 24%drop acid clopyralid.
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