Three barley cultivars, Shyri, Clipper and Terán, with different levels of partial resistance to barley leaf rust, caused by Puccinia hordei, were exposed to six levels of the pathogen. These levels were obtained by 5, 4, 3, 2, 1 and 0 fungicide (Propiconazol) applications respectively and occurred every 15 days starting at 66 days after sowing. No application served as the control treatment. There were three replicates. The six-row plots were surrounded by a row of a highly susceptible barley cultivar in which the barley leaf rust arrived naturally in a fairly early plant stage. The disease severity was assessed five times with 15 days intervals starting at 66 days after sowing. The yields were determined by harvesting the inner four rows of the plots. An analysis of variance was carried out on the area under the disease progress curve (AUDPC) data and on the yield data. `Shyri¿ was the least susceptible cultivar, `Terán¿ the most. The percentage yield losses varied with the six levels of pathogen from 0 to 31.5% (`Shyri¿), from 0 to 46% (`Clipper¿) and from 0 to 63.5% (`Terán¿). The yield losses correlated strongly with the AUDPC, the linear correlation coefficient being 0.97. The yield losses indicate the importance of the pathogen in Ecuador. It also means that high levels of partial resistance are needed to prevent significant yield damage.
- spring barley
- brown rust
Ochoa, J., & Parlevliet, J. E. (2007). Effect of partial resistance to barley leaf rust, Puccinia hordei, on the yield of three barley cultivars. Euphytica, 153(3), 309-312. https://doi.org/10.1007/s10681-006-9168-6