Control effects of nine herbicides on Kummerowia striata in Cynodon dactylon lawn

The control effects of nine herbicides (72% 2,4-D butylate EC, 40% Ethachlor + atrazine SC, 40% Bensulfuron-methyl+quinclorac SP, 56% MCPA-Na SP, 40% Asulam AS, 41% Glyphosate isopropamide AS, Benazolin-ethyl AS, Warm-season Turfgrasses Herbicides SP, and Worst broad leaf herbicides EC) on Kummerowia striata in Cynodon dactylon lawn were assessed. The efficacy indices and the control effects of the plant were recorded after 3, 6, 12, 20, and 30 days, the control effects of fresh weight were recorded after 30 days, and the influence on the growth of C. dactylon was observed on 3, 6, 12, 20, 30, and 45 days after the herbicide application. The results showed that Worst broad leaf herbicides EC and Warm-season Turfgrasses Herbicides SP resulted in the highest efficacy index, the greatest control effect on the plant, and the greatest control effect on the fresh weight of K. striata in C. dactylon lawn (efficacy indices, 99.07%+0.09% and 98.77%+0.15%; control effects of the plant, 93.50% and 91.50%; control effects on the fresh weight, 86.61% and 85.78%, respectively). No injury to the growth of C. dactylon was observed after treatment with Worst broad leaf herbicides EC, but the others caused “Minimal injury” or “Slight injury” or “Visible injury” to the lawn. It was concluded that Worst broad leaf herbicides EC could be used to control K. striata in C. dactylon lawns.