Comparative effects of different types of tank‐mixed adjuvants on the efficacy, absorption and translocation of cyhalofop‐butyl in barnyardgrass (Echinochloa crus‐galli [L.] Beauv.)

The efficacy of cyhalofop‐butyl with tank‐mixed adjuvants on barnyardgrass ( Echinochloa crus‐galli [L.] Beauv .), as well as the physico‐chemical properties, absorption and translocation, was evaluated and compared. The efficacy experiment showed that the treatments with tank‐mixed adjuvants were approximately twofold more effective than with cyhalofop‐butyl alone at 2% (v/v) (silwet 625 at 0.05%). The surface tension decreased and the droplets could spread automatically on the leaves after adding the adjuvants. The spreading speed increased significantly with the adjuvants. The epidermal cells and wax layer were damaged by the adjuvants. The absorption of cyhalofop‐butyl was increased significantly after adding the tank‐mixed adjuvants. GY‐T12 and silwet 625 were conducive to upward translocation and all six tank‐mixed adjuvants promoted the downward translocation of the herbicide. The results demonstrate that adjuvants can have a considerable influence on the efficiency of cyhalofop‐butyl on barnyardgrass.