Amare and Mohammed Greener Journal of Agricultural Sciences Vol. 4 (7), pp. 288-294, August 2014. ISSN: 2276-7770 Research Paper Manuscript Number: 071414302 DOI: http://dx.doi.org/10.15580/GJAS.2014.7.071414302 Chemical Management of Weeds in Common Bean (Phaseolus vulgaris) Tesfay Amare and Amin Mohammed* Department of Plant Science, College of Agriculture and Veterinary Science, Ambo University, Post Box No: 19, Ethiopia. *Corresponding author’s Email: aminmahammed @gmail .com Abstract: Common bean production (Phaseolus vulgaris) is severely infested by weeds in Ethiopia. Field experiments were conducted in 2012 and 2013 at Ambo University, Ethiopia, to determine the effect of pre emergence herbicide s-metalachlor on weed dynamics and yield of common bean (Phaseolus vulgaris) in completely randomized block design with three replications. The field experiments were comprised of 5 treatments including s-metolachlor (dual gold) 1.00, 1.50 and 2.00 kg ha-1, weed free and weedy check were used. The common bean in both years were infested with Amarathus hybridus L., Datura stramorium, Erucastrum arabicum Fisch and May, Galinsoga parviflora cav., Ipomea ariocarpa, Nicandra spps, Oxalis corniculate L., Oxalis latifolia L. and Polygonum nepalense Meisn. Among the treatments, hand weeding standard check and s-metolachlor at 2.00 kg ha-1 significantly reduced density and dry weight of weeds during 2012 and 2013 years.Moreover,hand weeding and s-metolachlor at 2.00 kg ha-1 significantly increased the plant height, number of pods per plant, and seeds per pod as compared to other treatments. The highest grain yield was recorded on hand weeding plot followed by s-metolachlor at the rate of 2.00 kgha-1. However, no significant difference was observed between them, whereas, the lowest grain yield was recorded on untreated plot (weedy check). Weed infestation resulted in a caused a yield reduction of 72.5% and 63.5% in 2012 and 2013, respectively. Pre- emergence application of s -metolachlor at the rate of 2 kg ha-1 was found to be more effective in controlling weeds and increased the c yield in common bean. Keywords: Common bean, s-Metolachlor, Pre emergency herbicide, Weed flora. Return to Content View [Full Article – PDF] [Full Article – HTML] [Full Article – EPUB] Reference: Allen, DJ, Dessert M, Trutmann P, and Vass J, (1989). Common bean in Africa and their constraints.1-32p. In: Schwartz H. F. and Pastor-Corrales. Bean production constraints in the tropics, 2nd edition. CIAT, Cali, Colombia. CIMMYT, (1988). Farm agronomic data to farmer’s recommendations: a training manual completely revised edition. International maize and wheat center, Mexico Frehiwot M, (2010). Profile of Haricot bean production, supply, demand and marketing issues in Ethiopia. Ethiopia Commodity Exchange Authority, Addis Ababa – Ethiopia. Gill, HKR McSorley, G Goyal, and SE Webb, (2010). Mulch as a potential management strategy for lesser cornstalk borer, Elasmopalpus lignosellus (Insecta: Lepidoptera: Pyralidae), in bush bean (Phaseolus vulgaris). Florida Entomologist 93(2): 183-190. Habtu A, (1994). Epidemiology of bean rust in Ethiopia, Ph.D Thesis. The Netherlands: Wageningen Agricultural University. 172p. Jafari R, Rezai S, Shakarami J, (2013). Evaluating effects of some herbicides on weeds in field bean (Phaseolus vulgaris). International Research Journal of Applied and Basic Sciences, 6 (8): 1150-1152. Jaya Suria ASM, Juraimi AS, Rahman MDM, Man AB, Selamat A, (2011). Efficacy and economics of different herbicides in aerobic rice system, Afri. J. Biotec., 10(41): 8007-8022. Mehmeti AA, Demaj I, Demelezi and Rudari H, (2012). Effect of Post-Emergence Herbicides on Weeds and Yield of Maize, Pak. J. Weed Sci. Res. 18(1): 27-37. Mohammed A, Ayalew A, Dechassa N, (2013). Effect of Integrated Management of Bean Anthracnose (Colletotrichum lindemuthianum Sacc. and Magn.) Through Soil Solarization and Fungicide Applications on Epidemics of the Disease and Seed Health in Hararghe Highlands, Ethiopia. J Plant Pathol Microb 4: 182 doi:10.4172/2157-7471.1000182 Morad S, (2013). Effect of cultivation time and weeds control on weeds and some characteristics of Broad bean (Vicia faba L.). Adv. Agri. Biol. 1 (2), 2013: 51-55. Pynenburg GM, Sikkema PH, Robinson DE, Gillard CL, (2011). The interaction of annual weed and white mold management systems for dry bean production in Canada, Canadian Journal of Plant Science. 587-598. Waters BM, Morishita D, (2001). Integrated weed management in dry edible bean, A Pacific Northwest Extension Publication University of Idaho Oregon State University Washington State University.