Abstract
More than 5,000 Ethiopian lines of sorghum were evaluated for yellow sugarcane aphid, Sipha flava (Forbes), resistance. Three lines (PI 453951, PI 457709, and PI 457715) were moderately resistant as determined by visual damage ratings of seedlings in greenhouse flat tests. These lines were then subjected to additional tests to determine the components or mechanisms of resistance. All three lines exhibited antibiosis, with an average of 19.0, 22.3, and 25.0 nymphs per adult on PI 453951, PI 457715, and PI 457709, respectively, compared with 62.3 nymphs per adult on PI 264453, a widely used source of resistance to green bug ( Schizaphis graminum (Rondani)). Antixenosis (nonpreference) did not appear to be a resistance mechanism of these lines. In the tolerance test, growth of plants infested with yellow sugarcane aphid ranged from 77% of the uninfested plants of PI 457715 to 36% in PI 264453. Although the level of yellow sugarcane aphid resistance is not as high as the green bug resistance that has been incorporated into many sorghum hybrids, these lines appear to be the best sources currently available. Thus, field tests and inheritance studies with the three lines are justified.
Published Version
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