1 January 2018 Supercooling Point of Selected Developmental Stages of Culex pipiens pallens (Diptera: Culicidae)1
Lijuan Liu, Benguang Zhang, Xiaoli Tong
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Culex pipiens pallens Coquillet is an important public health pest and can spread various mosquito-borne infectious diseases. To assess the cold resistance of Cx. pipiens pallens, the supercooling points (SCPs) and freezing points (FPs) of Cx. pipiens pallens, including 1st through 4th larval instars, pupae, and male and female adults, were identified in the laboratory. SCPs of Cx. pipiens pallens ranged from −18.0353 to −7.9854°C. SCPs differed significantly among larvae, pupae, and adults (F = 338.434, df = 170, P < 0.05), but did not differ significantly between male (−17.9173 °C) and female (−18.0353 °C) adults. The mean SCPs of the imaginal stage were much lower than those of larvae and pupae. Unlike SCPs, the FPs of Cx. pipiens pallens, ranging from −12.8777°C to −5.5550°C, were not significantly different from 1st instars through the pupal stage, but were much higher than those of the imaginal stage (F = 29.92, df = 170, P < 0.05). These results suggest that Cx. pipiens pallens has the potential to spread farther northward into higher-latitude regions in China.

Lijuan Liu, Benguang Zhang, and Xiaoli Tong "Supercooling Point of Selected Developmental Stages of Culex pipiens pallens (Diptera: Culicidae)1," Journal of Entomological Science 53(1), 55-61, (1 January 2018). https://doi.org/10.18474/JES17-24.1
Received: 23 February 2017; Accepted: 1 May 2017; Published: 1 January 2018
cold hardiness
Culex pipiens pallens
freezing point
supercooling point
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