Author： MAYO Z. B. STARKS K. J.
Publisher： Entomological Society of America
ISSN： 1938-2901
Source： Annals of the Entomological Society of America, Vol.67, Iss.3, 1974-05, pp. : 421-423
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Abstract
Alary polymorphism of Schizaphis graminum (Rondani) was influenced by the immediate temperatures to which the greenbugs were exposed and by the temperatures at which the ancestral and parental generations were colonized. Higher percentages of alatae were produced when aphids were exposed to 27° C than when they were exposed to 21 or 24°C. Aphids colonized at 4°C produced greater percentages of alatae than those colonized at 21, 24, or 27°C when the progeny were exposed to 21, 24, and 27°C. No significant difference in the production of alatae occurred when nymphs were exposed at 27 and 29°C. Colonizing temperatures of 21, 24, or 27°C did not significantly alter the total reproduction of nymphs though the total reproduction of aphids colonized at 21 °C was significantly higher than that of aphids colonized at 4°C. However, the percentages of alatae produced by nymphs from parents colonized at 21 °C were not significantly different from the percentages from parents colonized at 24 or 27°C.
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