Proper adjuvant selection to enhance the activity of triclopyr combined with metsulfuron on the control of Hedyotis verticillata

A study was conducted to evaluate the combined activity of a tank mixture of triclopyr plus metsulfuron with non-ionic surfactant (NIS), crop oil concentrate (COC), and organosilicon (OS) adjuvants on the control of Hedyotis verticillata under glasshouse and field conditions. The results of both the glasshouse and field experiments showed that 160 g ai ha−1 triclopyr plus 0.2 g ai ha−1 metsulfuron and 320 g ai ha−1 triclopyr plus 0.4 g ai ha−1 metsulfuron, with the addition of 0.25% NIS, 0.05% COC, or 0.05% OS, were effective in controlling H. verticillata. A comparison of the cost revealed that the most cost-effective combination for controlling H. verticillata is 160 g ai ha−1 triclopyr plus 0.2 g ai ha−1 metsulfuron combined with 0.25% NIS.