To determine the components of host plant resistance to Schizaphis gramimon (Rondani), eleven sorghum selections were compared in green house and growth chamber studies. BOK-8, the susceptible check, was preferred by the adults in free-choice tests. Some of the selections were highly nonpreferred by both apterate and alate forms. Antibiosis was also a resistant factor in some selections since there were fewer nymphs having smaller weights on some selections, and the time until reproduction started was lengthened. Tolerance measured by plant-height differences between infested and uninfested plants of each entry and by plant-injury ratings indicated that this may be the main component of PI-264453. Five of the selections (PI-229828, IS-809, Shallu Grain, PI-302178, and PI-226096) indicated comparatively high degrees of all three resistance components. Five species of the genus Sorghum showed resistance by one or more components.
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Schuster et al. (1973) studied this question.