Investigating the efficacy of herbicides to control dandelions (Taraxacum syriacum Boiss.) in lawn of Landscape

Urban landscapes are considered as one of the main elements of beauty in cities. In order to investigate the effect of different herbicides on the control of dandelion in the lawn, an experiment was conducted in the greenhouse and natural landscape of University of Mohaghegh Ardabili in 2021. For this purpose, first, in the screening test, nine broad-leaved and dual-purpose herbicides were tested at 0.25, 0.5 x , 1 x and 2 x recommended dose with a control (no herbicide application) in the greenhouse environment on dandelion seedlings. After the statistical analysis of the data from this stage, six herbicides bromoxynil, U46, Otello, Dylan, Atlantis and Total were selected and tested at 0.5, 1 and 2 of recommended dose with the control in natural conditions. It was used in three replications in the landscape infected with dandelions in plots of 1 square meter (1x1). In natural condition, applied of bromoxynil and U46 reduced dandelion dry weight by more than 50% compared to control, which had significantly different with other treatments (except Total). In this case, level of visual scoring on lawn was less than 20% in U46, Bromoxynil, Dylan, Atlantis and Total herbicides and had no significant difference between them. Application of 2x recommended dose of bromoxynil, U46 and Atlantis herbicides had the lowest density of dandelion, which was 37, 50 and 37% less compared with control (dose 0), respectively.