Laboratory studies showed that the emergence of Rhagoletis pomonella is affected by the relative humidity of the environment. When pupae were incubated at 77° F. and relative humidities of 20, 40, 60, 80 and 100 the percentages of emergence were 0, 0, 4, 81 and 70 respectively.
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W. T. A. Neilson (1964) studied this question.
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