Effect of time of application on efficiency of sulfosulfuron (Apyros 75 WG) on different species of wild barley (Hordeum spp.)
2008
Baghestani Meybodi, Mohammad A`li | Zand, Eskandar | Bena Kashani, Fatemeh | Yazdi, Majid
Population of different barley species is increasing due to continuous applications of grass-weed herbicides. So, introduction of more efficient herbicide options to control these weeds is necessary. Sulfosulfuron is among highly efficient herbicides but its efficacy depends on weed phenological stage. Three experiments were conducted in 2006-2007 in greenhouse facilities of the Iranian Plant Protection Research Institute, Tehran to study the best application timing and number of spraying of sulfosulfuron. Results indicated that among studied herbicides, sulfosulfuron, and metsulfuron + sulfosulfuron had the best efficacy in controlling the barley species. Sulfosulfuron could best control Hordeum spontaneum when it was applied at two- to six-leaf stage. The best application timing in case of H. murinum and H. vulgare were at eight-leaf stage while that for H. distichon was at two- to four-leaf stage. Overall, it was concluded that application of sulfosulfuron at the proper stage of the weed results in no increase in the herbicide application dose and satisfactory result would be achieved by application of sulfosulfuron at 27 g ha-1. Delay in herbicide application results in an increase in herbicide application dose or re-spraying.
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