Individual study: Autumn application of herbicides improves Macartney rose Rosa bracteata -infested coastal prairies near Benchley and Bloomington, Texas, USA
Scifres C.J. (1975) Fall application of herbicides improves Macartney rose-infested coastal prairie rangelands. Journal of Range Management, 28, 483-486
Macartney rose Rosa bracteata (native to China), was introduced to the USA in the early 1800s. It has become invasive and is a severe management problem on over 200,000 ha of rangeland in southeast Texas, particularly in the Gulf Prairies and western Quercus stellata savanna. Various herbicide control trials were undertaken near the village of Benchley and Bloomington town.
Benchley: On Macartney rose plants averaging 1 m tall x 2.5 m canopy diameter, several herbicides and herbicide combinations (equal amounts, 1:1, of each) were tested at 1.12 kg/ha: 2,4-D, 2,4-D with picloram or dicamba; 2,4,5-T and silvex each alone or with picloram or dicamba; and dicamba with picloram. Herbicides were applied on 26 September 1970 (sprayed from the ground in 94 l/ha of water plus 0.5% commercial surfactant) to l0 x 35 m plots (randomized complete block design; 3 replications).
Best Macartney rose control was achieved with picloram combined with 2,4,5-T at 0.56 or 1.12 kg/ha; aerial application at 1.12 kg/ha reduced rose canopies by 70-80% after a year. This combination was equally effective applied in water containing 0.5% surfactant or in a diesel oil:water (1:4) emulsion. Alone, 2,4-D at 1.12 kg/ha (standard treatment) also had good results reducing canopies by 40-50%.