Abstract
(1) Approximately 29,000 chrysanthemum aphids (Macrosiphum sanborni) were reared under controlled conditions to study the effect of light, temperature, wilting of the host plant, presence or absence of wings in the parents and environment of the stock on wing production. (2) Every one of the factors tested had a noticeable influence on wing production. A weighting of their effects would assign the greatest influence to the light conditions prevailing during the experiment. Second place would be given to the temperature used during the experiment. The environment of the stock from which the experimental animals were drawn is third in importance, followed by the presence or absence of wings in the parent aphids. The least effective of all the agents tested was the condition of the host plant, whether wilted or fresh. (3) The highest percentages of winged progeny were produced by parents reared in continuous light or in the longer intervals of light out of a 24-hour period, the proportion decreasing (somewha...
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