Influence of Nine Adjuvants on Weed Control Effects of Fenoxaprop-P-ethyl and Clodinafop-propargyl

WU Renhai; SUN Huihui; WANG Yanbing; SU Wangcang; XUE Fei; XU Hongle; LU Chuantao?; SUN Jianwei

Abstract：Experiments in greenhouse were done to test the synergy of nine adjuvants on the weed control of Fenoxaprop-P-ethyl and Clodinafop-propargyl against Sclerochloa kengiana, in order to find effective synergists of herbicides for controlling grass weeds in wheat field. The results showed that the Biopower, Quelex’ s adjuvants,organic silicon and lubrication oil could increase the weed control effect of two kinds of herbicides,with 1—3 damage level enhancement for Fenoxaprop-P-ethyl and 1—4 damage level en-hancement for Clodinafop-propargyl. The Avermectin could enhance the weed control effect of Clodinafop-propargyl,with the weed phytotoxicity level increased by 1—4 levels after 14 days. But Avermectin might reduce the weed control effect of Fenoxaprop-P-ethyl,with the weed phytotoxicity level of Fenoxaprop-P-ethyl lowered by 1—2 levels at 7 d after treatment. The two kinds of methyl oleate produced by different manufacturers showed different influence on two kinds of herbicides. The methyl oleate A made the weed phytotoxicity level lower by 1—2 levels of Fenoxaprop-P-ethyl or increase by 1—4 levels of Clodinafop-propargyl. But the methyl oleate B had little influence on Fenoxaprop-P-ethyl and Clodinafop-propargyl. After 21 days, the Biopower and organic silicon could significantly improve the fresh weight inhibition effect of Fenoxaprop-P-ethyl. With addition of Quelex’ s adjuvants and organic silicon,the inhibition effect of Clodinafop-propargyl 90 g/ha was enhanced from 86 . 66% to over 90%. The results of 7 d and 14 d af-ter treatment showed that the adjuvants might enhance the weed control effect by extending the lasting pe-riod of herbicides.