Abstract: The influence of environmental factors and age of plant on the control of bermudagrass was studied in the phytotron. The results showed that glyphosate gave better control on bermudagrass under high light intensity and high soil hmnidity than under low light intensity and low soil humidity. During the first two weeks the efficiency of glyphosate treatment differed markedly; however, the difference between these different conditions deminished with the increase in concentration or with prolonged treatment. The environmental factors and concentration of glyphosate also exerted a significant influence on the resumption of the plant growth thereafter. The lower the light intensity the less was the potential capacity for resumption of the growth. In our experiments there was no resumption of growth after the treatment with glyphosate at a concentration of 0.4%. The response of bermudagrass at different ages to glyphosate was significantly different. The older the plant the higher was the percentage of the survival and the resumption of the plant growth.