Some Effects of Alternating Temperatures and Exposure to Cold on Embryonic Development of the Beet Leafhopper1, 2

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Abstract
In studies of the beet leafhopper, Eutettix tenellus, under controlled conditions in the laboratory, embryonic development was always completed in less time under alternating temps. than would be expected on the basis of that required at constant temps. A constant humidity of 50 [plus or minus]: 1% was maintained with all temps. In exposures of 4, 8, 12, 16, and 20 hrs. daily at 90[degree] F, alternating with exposures for the remainder of each 24-hr, period at 80[degree], 70[degree], 60[degree], or 50[degree] F, the % of acceleration increased with shorter exposures at the higher temp. and with greater difference between the higher and lower temp. Some acceleration was also produced in similar periods of alternate exposure to 90[degree] and 40[degree] F. Continuous exposures of 5 to 15 days at 50[degree] F accelerated and at 40[degree] F retarded subsequent development at 90[degree] F.

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