Use

Fentrazamide is highly effective in the control of annual grass weeds (Echinochloa spp., C. difformis, S. juncoides) and broadleaf weeds (L. pyxidaria, M. vaginalis). It controls barnyard grass of zero- to three-leaf stage at application rates of 200 300 g ha1. This compound is also characterized by a long-term residual activity and shows excellent safety toward both transplanted rice and seeded paddy rice. Indeed, based on these properties, fentrazamide became the first paddy herbicide to be used as simultaneous treatment at the time of transplanting. The mixture partners of fentrazamide in one-shot paddy herbicides include sulfonylureas such as bensulfuron-methyl (Innova) or pyrazosulfuron-ethyl (Doublestar) and 4-HPPD inhibitors such as benzobicyclon (Smart). In Southeast Asian countries, fentrazamide is used as a mixture with propanil (Lecspro) to treat direct-seeded rice.