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Resistant varieties of barley and sorghum complemented activity of a parasite, Lysiphlebus testaceipes (Cresson), in reducing damage to plants and production of greenbugs, Schizaphis graminum (Rondani). However, the number of mummies formed by the parasite did not correspond completely to the number of greenbugs that disappeared. Resistant plants had fewer and smaller mummies compared with susceptible plants. The age of the sorghum plants made little difference in the relationship.
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Starks et al. (1972) studied this question.
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