Management of Faba Bean rust (Uromyces viciae-fabae) Using Fungicides and Host Resistance in the Hararghe Highlands, Ethiopia

Abstract

Two Held experiments were carried out at Haramaya and Hirna of Hararghe highlands, Ethiopia in 2 0 0 9/2010 to determine the effect of four fungicides on the epidemics of faba bean rust (Uromyces viciae-fahae). using moderately resistant (Cicbelcho) and susceptible (NC5 8) varieties. Disease severity, disease progress rate (r ). and area under disease progress curve (AUDPC) were used to evaluate treatment effects. Rust epidemics were 0.12 and 0.10 units per day at Haramaya and Hirna, respectively on the susceptible
cultivar, NC5S. while it was 0.07 and 0.09 units per day at Haramaya and Hirna. respectively on the moderately resistant cultivar. Gcbclcho under natural djseasc epidemics. The severity and rate of rust progression were significantly influenced by resistance of the cultivars. Fungicide application significantly reduced rust severity and AUDPC. Treatment of faba bean with mancozcb at the rate of 1.6 a. i. kg/ha resulted in significant reductions in final rust severity, disease progress rate and AUDPC, and producing the highest yield of 4.4 and 4.6 t/ha at Haramaya and Hirna. respectively. Integration of Cicbelcho and mancozcb foliar sprays proved the best option out ol all, which provided 2 7 5% and 36 6% marginal rate of return (MRR) at Haramaya and at Hirna, respectively. Differences existed between locations and these could be due to differences in environmental factors