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Paraquat herbicide weed control efficacy in stale seedbed practices was evaluated by split plots arrangement according to a randomized complete block design with three replications in Lorestan province during 2009 and 2010. The common bean seed rate (in three levels: 100, 150 and 200 kg.ha-1) and weed management in seven levels (1. Trifluralin PPI; 2. Paraquat PRE; 3. Bentazon+acifluorfen POST; 4. Trifluralin PPI+ Bentazon+acifluorfen POST; 5. Paraquat PRE +Bentazon+acifluorfen POST; 6. Hand weeding; 7. Weedy check) were allocated to main plots and sub plots, respectively. In the first year, among the herbicide treatments, the lowest weed density was belonged to the paraquat PRE+Bentazon+acifluorfen POST, that reduced weed density by 68% in comparison to weedy check. Trifluralin PPI+ Bentazon+acifluorfen POST, Paraquat PRE +Bentazon+acifluorfen POST, and Bentazon+acifluorfen POST alone were reduced weed biomass 83, 82 and 70%, respectively. Based on the second year experimental results, all management treatments significantly reduced weed density compared to weedy check. Treatments included Trifluralin PPI, by average were reduced weed density 77% compared to weedy check. Integrated application of Paraquat PRE+Bentazon+acifluorfen POST, also reduced weed density by 55%, and had not significant differences with superior treatment.

Efficacy of fomesafen and storm (bentazone+aciflorfen) herbicides on common bean (phaseolus vulgaris L.) weed control were evaluated in a randomized complete block design with four replications during 2008 in Lorestan Province. Herbicides were applied postemergence at three trifoliate growth stage of common bean. Herbicide injury on weeds reached maximum three days after treatments and common bean was recovered from initial injury of herbicides especially their combinations with high dose at 14 days after treatments, so that treatments had no persistent injury effect on crop. Tank mixture of fomesafen (1.5 L.ha-1) and storm (1.5 L.ha-1) treatment controlled weeds by 71.3% and based on visual injury monitoring, this mixtures controlled Physalis divaricata, Hibiscus trionum, and Portulaca oleracea 92.8, 81.3, and 63.8%, respectively. In general, visual evaluation 14 days after treatments, fomesafen (1.5 L.ha-1) mix with storm (1 or 1.5 L.ha-1) controlled weeds by 80% and it was not significantly differed from hand weeding. Results of this research indicated that fomesafen and storm herbicides, and their combinations at proposed doses may apply postemergence for weed control in common bean.