中文摘要：

【目的】为明确变温条件对二点委夜蛾Athetis lepigone（Mschler）实验种群生长发育的影响。【方法】分别设置6个变温组合（20/24℃,20/28℃,20/32℃,24/28℃,24/32℃和28/32℃）,通过测定和计算各虫态发育起点温度和有效积温及生命表参数来研究变温对二点委夜蛾卵、幼虫、蛹、世代平均发育历期、存活率和繁殖力的影响。【结果】不同变温组合对二点委夜蛾各虫态的发育历期、存活率及种群繁殖力有显著影响。发育历期随着变温组合平均温度的升高而缩短,二点委夜蛾世代存活率由大到小的顺序为24/28℃〉20/32℃〉28/32℃〉20/28℃〉24/32℃〉20/24℃。24/28℃时产卵量最高,单雌产卵量为390.70粒。世代发育起点温度和有效积温分别为10.37℃和663.17日·度。在不同变温组合下内禀增长率rm值随着平均温度的升高先上升后降低。在24/28℃时,二点委夜蛾rm、净增殖率R0和周限增长率λ最大,种群加倍时间t和世代平均周期T最小。【结论】24/28℃是二点委夜蛾实验种群生长发育及繁殖的最适变温组合,本研究结果为二点委夜蛾的预测预报及综合防治提供了科学依据。

英文摘要：

[ Aim] This study aims to understand the influence of alternating temperature on the growth and development of experimental populations of Athetis lepigone. [ Methods ] We measured and calculated the developmental threshold temperature, effective accumulated temperature and life table parameters to study the influence of different combinations of alternating temperatures （20/24℃, 20/28℃, 20/32℃, 24/28℃, 24/ 32℃ and 28/32℃ ） on the mean developmental duration, survival rate and fecundity of A. lepigone. [ Results ] The results showed that the duration of different developmental stages of A. lepigone shortened as the average temperature in each alternating temperature combination increased. The generation survival rate of A. lepigone decreased in the order of 24/28℃ 〉 20/32℃ 〉 28/32℃ 〉 20/28℃ 〉 24/32℃ 〉 20/24℃. The fecundity was the highest at 24/28℃, with 390. 17 eggs laid per female. The developmental threshold temperature and effective accumulated temperature of the whole generation was 10.37℃ and 663.17 degree-days, respectively. The intrinsic rate of natural increase （rm ） initially increased and then decreased as the average temperature of each altemating temperature combination increased. At 24/28℃, the intrinsic rate of natural increase （rm ）, net reproductive rate （RO ）, the finite rate of increase （A） were the highest, while the doubling time （t） and generation time （T） were the minimum. [ Conclusion] The results suggest that the temperature combination 24/ 28℃ is the optimal combination of alternating temperatures for the development of experimental populations of A. lepigone. These results provide a scientific basis for the prediction and integrated rnanangement of A. lepigone.