Proceedings of the 2 nd Annual Conference of Ambo University / 2014 [14] Evolution of Some Fungicides and Bioagents for Management of Anthracnose (Colletotrichum lindemuthianum (Sacc. & Magnus) Briosi & Cavara. in Common Bean at Ambo, Ethiopia Amin Mohammed, Teshale Jifara, Tesfay Amare and Thangavel Selvaraj Department of Plant Science, College of Agriculture and Veterinary Science, Ambo University, Ambo, P. O. Box 19, Ethiopia Abstract Common bean anthracnose is a major production constraint in bean growing regions of Ethiopia. This study aimed to determine whether foliar sprays of mancozeb, folpan and mancolaxyl or antagonistic bioagents; Trichoderma harzianum, Trichoderma viride and Pseudomonas fluorescens could reduce anthracnose symptoms and consequently, increase yield and yield components. A total of seven treatments were arranged in a randomized complete block design with three replications. Results obtained showed significant differences among the treatments. Anthracnose incidence, severity, infected pods per plant and the area under disease progress curve were highest in the control plots compared to the fungicide sprayed and bioagent treated seed plots. The highest percentage of infected pods per plant, 78.9 and 55.0 were recorded on the control and mancozeb sprayed plots respectively. The highest AUDPC value resulted in the lowest yield of 1.01 t/ha in the control plots compared to 3.33 t/ha obtained from the plots sprayed with folpan and 1.79 t/ha from plots treated with Pseudomonas fluorescens. Relative yield losses of 69.67, 46.25 and 22.82% were recorded from the control, seed treated plots with P. fluorescens and sprayed plots with mancolaxyl respectively. Economic analysis revealed that the highest rate of return of 8,740 was obtained from Pseudomonas fluorescens seed treatment and the highest net benefit; 43,154 on folpan foliar spray treatment. The results of the present study suggest the novel possibility of using folpan foliar spray and Pseudomonas fluorescens seed treatments to decrease anthracnose symptoms in bean plants and consequently, achieve greater yield. Key words: Bioagents, Folpan, Pseudomonas fluorescens, Mancolaxyl, Severity, seed treatment