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美国白蛾是一种重要的国际检疫害虫,作为外来入侵生物在中国不断扩散蔓延。过冷却点是研究其潜在适生区重要的生理指标之一。本文研究了不同虫态、寄主树木、低温驯化时间和地理种群与过冷却点的关系。结果表明:美国白蛾不同虫态过冷却点间存在显著差异(P<0.001),蛹期过冷却点最低(-15.91℃),5龄幼虫的过冷却点最高(-6.97℃),过冷却点随虫态龄期增加而升高;用悬铃木饲养的美国白蛾蛹的平均过冷却点为-16.09℃,显著低于复叶槭饲养的美国白蛾蛹的平均过冷却点-14.61℃(P=0.002);在6℃下分别驯化美国白蛾非滞育蛹24、48和72 h,美国白蛾非滞育蛹过冷却点无显著差异(P=0.846);武邑、内黄、濮阳、东营、寿光和沈阳6个不同地理种群美国白蛾蛹的过冷却点间存在极显著差异(P<0.001),其中内黄地区美国白蛾过冷却点最低(-21.39℃),东营地区过冷却点最高(-15.35℃)。
American white moth is an important international quarantine pest, as invasive alien species continue to spread in China. The subcooling point is one of the important physiological indexes for studying its potential suitable area. In this paper, we studied the relationship between different insect states, host trees, domestication time, geographic populations and subcooling points. The results showed that there was a significant difference (P <0.001) between the sub-cooling points of the B. medinalis and the lowest in the pupal stage (-15.91 ℃), the highest subcooling point (-6.97 ℃) The average supercooling point of A. japonicus pupae fed with Platanus was -16.09 ℃, which was significantly lower than the average supercooling point of H. americana pupae (-14.61 ℃) P = 0.002). The non-diapause pupae had no significant difference in non-diapause pupae (P = 0.846) at 24, 48 and 72 h after domesticated at 6 ℃ respectively. There were significant differences (P <0.001) between the subcooling points of pupae in six geographical populations of Puyang, Dongying, Shouguang and Shenyang, with the lowest subcooling point (-21.39 ℃) in the Nephrite area and the lowest in the Dongying area The subcooling point is the highest (-15.35 ℃).