论文部分内容阅读
【目的】双委夜蛾Athetis dissimilis(Hampson)是近几年在中国大陆新发现的农业害虫,与二点委夜蛾Athetis lepigone(Mschler)形态相似,危害特点相同。明确温度对其生长发育的影响,对该害虫的预测预报和有效防控具有重要的指导意义。【方法】在光周期16L∶8D,RH 70%±10%的实验室条件下,设置17,21,25,29和33℃5个恒定温度,饲喂人工饲料,研究温度对双委夜蛾发育历期、死亡率及繁殖的影响,并计算各虫态的发育起点温度和有效积温。【结果】在17~33℃范围内,双委夜蛾均可以完成整个世代,各虫态发育历期随温度的升高而缩短;17和21℃下,双委夜蛾幼虫有7个龄期,而25℃以上时幼虫只有6个龄期。25℃下双委夜蛾死亡率最低(21.00%),单雌产卵量最高(763.95粒)。整个世代的发育起点温度和有效积温分别为9.38℃和1 015.36日·度。雌雄虫寿命和产卵期随温度的升高逐渐缩短,且各温度下雌虫寿命均较雄虫长,性比(雄雌比)均在1.18~1.20之间。【结论】25℃是双委夜蛾实验种群生长发育和繁殖的适宜温度。
【OBJECTIVE】 Athetis dissimilis (Hampson) is a newly discovered agricultural pest in mainland China in recent years. It has the same morphological characteristics as Athetis lepigone (Mschler). Clear temperature on the growth and development of the impact of the pest forecasting and effective prevention and control has important guiding significance. 【Method】 Under the laboratory conditions of photoperiod 16L: 8D, RH 70% ± 10%, five constant temperatures of 17, 21, 25, 29 and 33 ℃ were set up and fed artificial diet. Developmental duration, mortality and the impact of reproduction, and calculate the development of each state of insect onset temperature and effective accumulated temperature. 【Result】 The results showed that during the period of 17 ~ 33 ℃, all the generations could be completed. The developmental durations of all the insect states were shortened with the increase of temperature. At 17 and 21 ℃, the larvae of H. exigua were 7 Period, while larvae only have 6 instars at 25 ° C and above. At 25 ℃, the mortality of C. exigua was the lowest (21.00%), and the highest fecundity was found (763.95). The developmental starting point and effective accumulated temperature of the entire generation were 9.38 ℃ and 1 015.36 days, respectively. The male and female longevity and spawning period gradually shortened with the increase of temperature, and the temperature of the females at all temperatures were longer than the male, sex ratio (male-female ratio) were between 1.18 ~ 1.20. 【Conclusion】 25 ℃ is the optimum temperature for the development and reproduction of the experimental population of the testicle.