Evaluation of Fungicides Efficacy for the Control of Yellow Rust (Puccinia striiformis f.s.tritici) Disease on Bread Wheat, Arsi Highlands of Ethiopia

Two new verification test fungicides namely Cayunis EC 325 (Bixafen 75g/L +Spiroxamine 150g/L + Trifloxystrobin 100g/L), and Tridium 70 WG (Mancozeb59.7%+Azoxystrobin 4.7%+Tebuconazole 5.6%WG and evaluated with standard checks called Nativo SC 300(trifloxystrobin 100 gm/lt + tebuconazol 200 gm/lt) were evaluated the efficacies in controlling the yellow (stripe) rust. The objective of the study was to evaluate and verify the efficacy of new fungicides against yellow rust disease control and recommend for registration. The trial was conducted in non-replicated with replication of sites at Meraro substation and Kulumsa agricultural research center, and Boru Chilalo farmers’ field. The test fungicides of Cayunis 325 EC and Tridium 70WG had decreased the disease severity to the lowest level of 20% at all locations but 60% to 90% disease severity was recoded on the unsprayed treatment. The highest grain yield was recorded from cayunis 325 EC treatment was recorded 5861, 6428, 5398kgha-1 whereas Tridium 70 WG was recorded 2878, 6035 and 3224kgha-1at Kulumsa, Meraro and Boru chilalo respectively. Although the differences of test fungicides were not statistically significant, treated plots consistently produced higher yields, thousand kernel weights, and hectolitre weights than untreated plots. The result revealed that Bixafen 75g/L +Spiroxamine 150g/L + Trifloxystrobin 100g/L), and Mancozeb59.7%+Azoxystrobin 4.7%+Tebuconazole 5.6%WG fungicides were effective in controlling yellow rust disease and improving high grain yield than trifloxystrobin 100 gm/lt + tebuconazol 200 gm/lt and unsprayed control treatments in all tested experimental sites and recommended for registration.