【摘要】 关于棉花伏蚜发育起点温度,有效积温及生殖频率的年龄分布的研究,到目前为止国内外未见报道。实验是在恒温10、15、20、25及30℃条件下进行的。除乙代10℃处理外,5个不同温度处理表现为随龄期增加而历期逐渐变短的趋势。面适宜温度为15℃及20℃。在恒温25℃及30℃条件下死亡率明显增高。发育起点温度及有效积温因不同龄期均有差异。更多还原

【Abstract】 The present experiments were conducted under the conditions of 5 different constant temperatures: 10℃,15℃,20℃, 25℃ and 30℃, The results showed that the heigher the instar is, the shorter the development period become,except treatment of 10℃ in generation B. The most proper temperature for development is around 15℃ to 20℃. When the temperature exceeds 25℃, the mortalities become higher apparently.Development thresholds and accumulated temperatures vary owing to different instars.更多还原