Effect of Temperature on Fecundity of Two Strains of the Greenbug1

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Abstract
The fecundity of two strains of greenbugs (Toxoptera graminum) on resistant Sel. 28-A wheat at temperatures of 35[degree]-100[degree]F. at intervals of 5[degree] was compared in the greenhouse at Stillwater, Oklahoma, in 1960. Fecundity of the field strain on susceptible Ward barley was also observed because this variety has been used as a culture host for both aphid strains. Fecundity of the greenhouse strain on the resistant wheat was similar to that of the field strain on susceptible barley. The field strain reproduced normally on both hosts at low temperatures, but at higher temperatures fecundity was greatly retarded on resistant plants.

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