不同光环境对粘虫生长发育的影响

Effects of different light wavelengths on the growth and reproduction of Mythimna separata

【目的】研究不同光环境条件对粘虫Mythimna separata生长发育存活的影响,探讨影响粘虫生存的关键光环境因子,揭示昆虫对光环境的适应能力,为粘虫发生分布情况进行准确预测提供实验依据。【方法】选取特定波长和光强的LED灯作为供试光源,以不同发育阶段粘虫为供试昆虫,测定10种供试光源条件下粘虫各发育阶段的存活与发育情况。【结果】365nm波长光源照射能显著降低粘虫卵孵化率,比对照组卵孵化率降低了50.33%;420 nm波长光源照射能显著降低粘虫幼虫存活率、幼虫化蛹率和蛹羽化率,且能延长幼虫期和蛹期,比对照组幼虫存活率、化蛹率和蛹羽化率分别降低了72.00%、65.67%和72.87%,比对照组幼虫期和蛹期分别延长了12 d和11.4 d;420 nm和460 nm波长光源照射能显著降低粘虫成虫存活率,比对照组成虫存活率分别降低了44.44%%和40.00%。【结论】光强1000lx,波长365、420、460 nm的光环境能够抑制粘虫的生长发育,不利于粘虫生存。

[Objectives] To investigate the effects of different light wavelengths on the growth, development and reproduction of Mythimna separata, identify the key factors affecting the survival of this pest and provide information to improve the accuracy of predictions of the distribution of M. separata and the adaptability of this pest to different light environments. [Methods] LED lamps of specific wavelengths and light intensity were selected as the test light source, and M. separata at different developmental stages as the test insects. The growth and developmental indices of M. separata at different developmental stages were determined under 10 different light sources. [Results] The hatching rate of M. separata eggs was significantly(50.33% < control) decreased by a 365 nm light source. A 420 nm light source significantly reduced larval survival, pupation and pupal eclosion, rates by 72%, 65.67% and 72.87%, respectively, and larval and pupal stages at this wavelength were respectively 12 days and 11.4 days longer than those of the control group. Wavelengths of 420 nm and 460 nm significantly reduced the survival rate of adult M. separata which were 44.44% and 40.00%, respectively, less than those of the control group. [Conclusion] A light intensity of 1 000 lx and wavelengths of 365 nm, 420 nm and 460 nm inhibit the growth, development and reproduction of M. separata.