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【目的】为明确变温条件对二点委夜蛾Athetis lepigone(Mschler)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。
【Objective】 To clarify the effect of temperature changing on the population growth and development of Athetis lepigone (Mschler) population. 【Method】 Six variable temperature combinations (20/24 ℃, 20/28 ℃, 20/32 ℃, 24/28 ℃, 24/32 ℃ and 28/32 ℃) were set up respectively. Temperature and effective accumulated temperature and life table parameters to study the effect of temperature on the egg, larva, pupae, the average developmental age, survival rate and fecundity of the second instar larvae. 【Result】 The results showed that different combinations of temperature had significant effects on the developmental stages, survival rates and population fertility of each stage insect. The developmental duration shortened as the average temperature of the variable temperature combination increased, and the survival rates of the two generations were 24/28 ℃> 20/32 ℃> 28/32 ℃> 20/28 ℃> 24/32 ° C> 20/24 ° C. The highest fecundity at 24/28 ℃ was 390.70 eggs per female. The developmental starting point and effective accumulated temperature for each generation were 10.37 ℃ and 663.17 ℃, respectively. Under different temperature combinations, the intrinsic rate of increase (rm) firstly increased and then decreased with the increase of average temperature. At 24/28 ℃, the second instar larvae rm, net growth rate R0 and the growth rate of the maximum cycle λ, population doubling time t and generation average period T minimum. 【Conclusion】 24/28 ℃ is the most suitable combination of temperature for the development and reproduction of the experimental population of the 2nd instar larvae. The results provided a scientific basis for the prediction and comprehensive prevention and control of the latter.