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Wondimu Adila,Habtamu Terefe,Agdew Bekele 한국작물학회 2021 Journal of crop science and biotechnology Vol.24 No.4
Common bacterial blight (CBB) is an economically important disease of common beans and causes signifcant yield losses worldwide, including Ethiopia. Therefore, development and use of resistant cultivars are important options to manage the disease. Thus, feld reactions of common bean genotypes to CBB and their agronomic performances were conducted at two locations in Southern Ethiopia, during 2018/2019. The experiment was arranged in a randomized complete block design with three replications. Analysis of variance revealed signifcant (P<0.01) genotypic variation for disease and yield parameters at both locations. The results showed wide ranges of variation in incidence (26.05–82.75%), severity (23.75–70.70%), AUDPC (773.9–2544%-days) and disease progress rate (0.024–0.142 unit day−1) on average for both locations. And also, remarkable genotypic variation for quantitative growth and yield characters such as plant height, days to 50% fowering, days to 90% maturity, number of pods, number of seeds, seed weight and grain yield were observed. Based on mean severity and R8_severity score, genotypes were grouped as 20% resistant, 55% moderately resistant and 25% susceptible at JARC, and 15% resistant, 80% moderately resistant and only 5% susceptible at Debub Ari. Variable relationships were found among and between parameters studied. The overall results indicated that SER119 and MALB135 showed consistent resistance reaction to CBB, and SER119 also gave high yield across felds. It is recommended to use SER119 with proper management practices for bean production and MALB135 as parent for CBB resistance development in plant breeding programs of the country