Abstract: 【Objective】 The objective of this study is to establish a causal relationship between dispersal of Colorado potato beetle, Leptinotarsa decemlineata (Say) and temperature, suggesting that temperature is the key limiting factor preventing Colorado potato beetle to colonize in Turpan area, Xinjiang, China. And to provide an empirical basis for the sustainable management of Colorado potato beetle. 【Method】 The emergency rates of the Colorado potato beetle larvae were observed under different temperatures and different times. And the critical high-temperature tolerance of Colorado potato beetle emergence was obtained. Combined with the historical climate data of Xinjiang, spatial analysis function of ArcGIS software was used to create a distribution map of the daily mean maximum temperatures of the Xinjiang in summer. 【Result】 With the increasing of temperature, the eclosion rate of Colorado potato beetle larvae was gradually decreased, and the developmental duration was gradually extended. When the temperature reached 39℃, the emergence rate approached zero, the critical high temperature of Colorado potato beetle eclosion tolerance was 39℃, and at the same time, the tolerance duration at temperature of 39℃ was 72 h. 【Conclusion】 Summer temperature in Turpan area can rise above 39℃ and lasts for more than a month. The extreme heat prevents Colorado potato beetle from colonizing in local areas and limits beetle’s dispersal eastward. It is necessary to strengthen the inspection and quarantine measures to prevent spreading of Colorado potato beetle eastward through human-facilitated transmission. This precautionary measure is critical for the sustainable production of potatoes and other Solanaceae crops.

Key words: Colorado potato beetle (Leptinotarsa decemlineata) , high temperature , Krig interplation , emergence rate , developmental duration