This study examined the growth performance and field evaluation of the dual herbicide-resistant transgenic creeping bentgrass plants. The effect of glyphosate treatment on the herbicide resistance of the transgenic creeping bentgrass plants was determined, and the non-transgenic control plant withered at the concentration 11 μg/mL or higher whereas the transgenic creeping bentgrass plants survived the treatment at the concentration of 3,000 μg/mL, and the increase of the plant length was repressed as the glyphosate treatment concentration was increased. At field evaluation, glufosinate-ammonium and glyphosate were simultaneously treated to investigate the weed control effect. The results showed that more than 90% of the weeds withered four week after herbicide treatment, while the transgenic creeping bentgrass plants continued to grow normally. Therefore, the dual herbicideresistant creeping bentgrass plants may be able to greatly contribute to the efficiency of weed control and to the economic feasibility of mowing in places such as golf courses.

• Ki-Won Lee(Grassland and Forages Division, National Institute of Animal Science, Rural Development Administration)
• Byung-Hyun Lee(Division of Applied Life Science (BK21 program), IALS, Gyeongsang National University)
• Bo-Ram Seo(Korea Research Institute of Chemical Technology)
• Jin-Seog Kim(Korea Research Institute of Chemical Technology)
• Sang-Hoon Lee(Grassland and Forages Division, National Institute of Animal Science, Rural Development Administration) Corresponding author