低温对美国白蛾越冬蛹的影响研究

The effect of low temperatures on the over-wintering pupae of Hyphantria cunea

美国白蛾Hyphantria cunea Drury是我国唯一一种被农业、林业共同列为检疫对象的害虫。本论文通过2010与2011年室内测定和室外调查的一系列研究表明,美国白蛾蛹在不同低温处理下随着处理时间的延长存活率逐渐降低。其中,-10℃下处理30 h后几乎没有越冬蛹存活,-15℃下处理3 h后越冬蛹的存活率低于5%,-20℃处理25 min后越冬蛹几乎没有羽化为成虫的个体。0℃低温处理对越冬蛹的低温存活率有重要影响,且随着0℃下处理的时间长短而发生变化,在0℃下处理时间越长则在-10℃下存活率越高。在0℃下处理150 min以后,存活率随处理时间的延长差异不显著。

The survival rate of Hyphantria cunea Drury pupae was found to reduce with increased time at low temperatures. Most pupae did not survive 30 hours at -10℃ , 3 hours at -15℃ or 25 minutes at -20℃. The survival rate of over-wintering pupae increased with prolonged exposure to 0℃ up to a maximum time of 150 minutes, after which there was no further significant increase.