Study of effectiveness of different combinations of selective herbicides for control of broadleaf weeds in Sugar beet (Beta vulgaris L.) fields

Field studies were conducted in 2005 to determine the effectiveness of different combinations of selective herbicides for control of broadleaf weeds in sugar beet fields in Tehran (Karaj), Khorasan Razavi (Mashhad) and Western Azarbayejan (Miandoab) provinces. Weed biomass and frequency and visual evaluation of weed injury and Sugar beet yield were those traits evaluated in this experiment. Weed biomass and frequency measurements in each province indicated that (phenmedipham + desmedipham + ethofumesate) + triflusulfuron methyl was the best composition. triflusulfuron methyl + desmedipham also was another composition that produced a good result. These treatments had no good effect on bindweed. The least herbicidal effect came from chloridazon + triflusulfuron methyl and chloridazon + (phenmedipham + desmedipham + ethofumesate) which had little effect on weed biomass and frequency.