Effect of Stripe Rust (Puccinia Striiformis F. p. ritici), Variety and Fungicide Application Time on Yield and Yield Components of Bread Wheat

The study was conducted to evaluate effects of bread wheat variety and fungicide application time on stripe rust epidemics under natural field conditions at Banja and Aneded in the main cropping season of 2019/2020 year. Four different fungicide application time (7, 14, 21, 28), including fungicide unsprayed combined with three wheat varieties (Wane, Danda’a and Kubsa) with different level of resistance to stripe rust were used in the experiment and the experiment was laid out in RCBD design with factorial arrangement and replicated three time. Disease data’s severity, AUDPC, incidence and Disease progress rate and also yield component and grain yield data were recorded. The maximum disease incidence (100%), on unsprayed plots of the susceptible Kubsa and moderately resistant Danda'a varieties in both locations was recorded. Additionally, 100% SRI was recorded on Kubsa variety plots applied 14, 21, and 28 days at Banja. But SRI was recorded in both the susceptible and resistant varieties when fungicide was sprayed 7 days after the initial symptoms appeared. Moreover, the maximum grain yield (4648.8kg/ha) was obtained from combination of Wane variety (Resistant and 7 days fungicide sprayed time at banja location. While the minimum yield (609.7 kg/ha) was obtained from fungicide unsprayed Kubsa variety (susceptible) at banja location. 7 days after initial symptom appeared fungicide sprayed varieties were effective to against Stripe rust and gave the highest values of yield over unsprayed plots and other fungicides application times. However, Combination of Wane variety and 7 days after initial symptom appeared fungicide application time was more feasible than other treatment combinations.