Asian Journal of Biological Sciences1996-3351xxxx-xxxxScience International10.3923/ajbs.2019.73.80IkhajiagbeBeckley OhanmuEdokpolor Osazee IguobaroMary Osasere 12019121Background and Objective: The problem caused by weeds are enormous and constitute a major constraint to crop production globally. Over the years, weed has contributed to the reducing in cowpea productivity either by releasing allelopathic compounds, providing a conducive environment for pest or competing for available soil nutrients. Therefore, the study examined the competition between the cowpea variety (TVu-180) and selected local weeds abundant in a typical ultisol in Benin city, Nigeria. Materials and Methods: There were 10 treatments and a control, namely; Chrysopogon aciculatus (WA), Eleusine indica (WB), Cynodon dactylon (WC), Axonopus compressus (WD), Panicumn maximum (WE), Setaria bartata (WF), Sporobolus pyramidalis (WG), Commelina benghalensis (WH), Paspalum vaginatum (WI), while WJ was a combination of all the weeds and control (CTR). Three seeds of TVu-180 was sown into each bowl per-treatments, laid out in a Randomized Block Design (RBD) with three replications. Results: From the results, the associated weeds delayed the first day of emergence in TVu-180 variety, however, there was no significant difference between the treatments and control. The emergent height of TVu-180 in WC, WE and WF were significantly higher than the TVu-180 variety in control. Weeds competitiveness with the TVu-180 variety resulted in a highly significant decrease in the plants’ dry weight either singly or holistically when compared with the control. The shoot length, stem width and leaflet area of the TVu-180 variety in WA were higher than those in the control. However, the no. of leaves were reduced in all treatments, there was no significant difference in between the TVu-180 variety in the WA treatment and control. Weed competitiveness resulted in the highest percentage of foliar foraging, chlorosis and necrosis in TVu-180 variety of WG and WC, respectively. From the regression plot, there was an inverse relationship between foliar chlorosis and percentage N, P and K in the soil while the correlation showed a significant positive relationship between foliar foraging and foliar chlorosis and necrosis respectively. Conclusion: Weed competitiveness did not affect the emergence performance of the Tvu-180 variety, however, the variety was morphologically susceptible with a significant reduction in dry weight matter.]]>Ayodele, J.T. and I.R. Yalwa,2004Vigna dekindtiana.]]>1120126Steel, W.M.,19961996pp: 183-185pp: 183-185Singh, B.B.,19931993Kormawa, P.M., J.N. Chianu and V.M. Manyong,20002000pp: 376386Ohanmu, E.O., B. Ikhajiagbe and B.O. Edegbai,2018Sphenostylis stenocarpa) exposed to cadmium stress.]]>2210531057Thio, I.G., E.P. Zida, M. Sawadogo and P. Sereme,2016Colletotrichum capsici strains, causal agents of brown blotch disease of cowpea in Burkina Faso.]]>1596104Abudulai, M., F. Kusi, S.S. Seini, A. Seidu, J.A. Nboyine and A. Larbi,2017100168176Kanteh, S.M., J.E. Norman and J. Sherman-Kamara,2014Aphis craccivora Koch) and foliage beetles (Ootheca mutabilis Sahl) on cowpea in sierra leone.]]>42433Adusei, G., T. Gaiser, O. Boukar and C. Fatokun,20161014931507Osipitan, O.A., J.A. Adigun and R.O. Kolawole,2016Vigna unguiculata) as a case study.]]>39096Osipitan, O.A.,201791120Patil, B.C., L.A. Padanad, K.H. Yashvantkumar, S. Soumya and L. Ravi,2014Vigna unguiculata (L.) Walp].]]>9124127Prabhu, G., R. Srinivasan, S.R. Kantwa, D.R. Palsaniya and M. Chaudhary,2015Vigna unguiculata (L.)].]]>18387Singh, M.C. and C.V. Sairam,20165558563Mekonnen, G., J.J. Sharma, T. Tana and L. Nigatu,2015Vigna unguiculata (L.) Walp.]. Eastern Wollo, Northern Ethiopia.]]>7326346Ohanmu, E.O., S.P. Bako and M.A. Adelanwa,2014Capsicum annuum L.).]]>2510Das, T.K.,2008pp: 901-902pp: 901-902Madukwe, D.K., H.C. Ogbuehi and M.O. Onuh, 2012Vigna unguiculata (L.) Walp) under rain-fed conditions of owerri.]]>1214261430Tripathi, S.S. and G. Singh,2001Vigna unguiculata L.).]]>336768Nangju, O.,20032003pp: 288-299pp: 288-299Ohanmu, E.O. and B. Ikhajiagbe,2018Sphenostylis stenocarpa to cadmium stress.]]>11125134Lemos, J.P., J.C.C. Galvão, A.A. da Silva, A. Fontanetti and L.M.C. Lemos,201223240Yadav, T., K.C. Nisha, N.K. Chopra, M.R. Yadav and R. Kumar et al.,2017613731385