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A greenbug (Toxoptera graminum (Rondani)) biotype has developed in greenhouse cultures at Stillwater, Okla. It is capable of destroying the resistant wheat lines Dickinson Sel 28-A., and C. L. 9058. When cultured on Dickinson Set 28-A for eight generations, greenbugs collected from field populations decreased in size, fecundity, and longevity, whereas those of the new biotype remained normal.
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Emily Wood (1961) studied this question.
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