绿光光照强度对灰茶尺蠖生长发育和繁殖的影响

Effects of green light intensity on development and reproduction of Ectropis grisescens Warren

【目的】探索不同光照强度绿光对灰茶尺蠖(Ectropis grisescens Warren)种群发展的影响,为茶园灰茶尺蠖的绿色防控提供技术支撑。【方法】以室内鲜叶饲养的灰茶尺蠖第5代1龄幼虫为材料,设置光照强度分别为40,80,120,140,240和340 lx绿光(波长520~525 nm)处理和对照共7个处理,每处理80头幼虫。其中绿光处理灰茶尺蠖白天用普通日光灯(150~200 lx)持续照射12 h,夜间用不同光照强度的绿光持续照射12 h;对照灰茶尺蠖白天用普通日光灯(150~200 lx)持续照射12 h,夜间持续黑暗12 h。测定不同光照强度绿光对灰茶尺蠖幼虫发育历期、存活率、蛹质量、化蛹率、成虫羽化率、成虫寿命、产卵历期、产卵量及卵孵化率的影响。【结果】随着绿光光照强度的增大,灰茶尺蠖幼虫的总发育历期缩短,其中240和340 lx绿光处理与对照差异显著;灰茶尺蠖5龄幼虫的存活率呈下降趋势,各绿光处理均与对照差异显著。除40 lx绿光处理外,其他光照强度绿光处理的灰茶尺蠖化蛹率显著低于对照。与对照相比,不同光照强度绿光处理雌虫和雄虫的蛹质量均有所下降,且雄虫的蛹质量低于雌虫。随着光照强度的增加,灰茶尺蠖成虫的羽化率呈下降趋势,其中120,140,240和340 lx绿光处理与对照差异显著。与对照相比,240和340 lx绿光处理成虫寿命显著缩短,单雌最高产卵量和平均单雌产卵量均显著下降,产卵历期也显著缩短。与对照相比,不同光照强度绿光处理的卵孵化率显著下降,最低仅为17.00%。【结论】240和340 lx绿光处理显著缩短了灰茶尺蠖幼虫的发育历期和成虫的寿命,降低了羽化率、产卵量及卵孵化率,从而抑制了灰茶尺蠖种群的发展速度,表明这2种强度绿光能有效防控茶园灰茶尺蠖。

【Objective】This study explored the effects of different green light intensities on development of Ectropis grisescens Warren to provide support for the green prevention and control of E.grisescens in tea plantations.【Method】The first instar larvae of the fifth generation of E.grisescens,which were reared in the room with fresh leaves,were treated with green light with intensities of 40,80,120,140,240 and 340 lx at wavelengths of 520-525 nm.There were 7 treatments in total including the control with 80 larvae in each treatment.The green light groups were irradiated by general fluorescent lamp(150-200 lx)for 12 hours during the day and by green light for 12 hours at night,while the control group was irradiated by general fluorescent lamp(150-200 lx)for 12 hours during the day and remained darkness for 12 hours at night.The effects of green light intensity on larval development duration,survival rate,pupa quality,pupation rate,adult emergence rate,adult longevity,duration of oviposition,female fecundity and hatching rate of E.grisescens were determined.【Result】With the increase of light intensity,the total developmental duration of E.grisescens larvae was shortened,among which 240 and 340 lx treatments were significantly different from the control.The survival rate of the 5th instar larvae of E.grisescens was decreased.Except for 40 lx,the pupation rates of E.grisescens of other treatments were significantly lower than that of the control.Compared with the control,the quality of male and female pupae decreased under different light intensities,and the quality of male pupae was lower than that of female pupae.With the increase of light intensity,the eclosion rate of E.grisescens adults decreased,and the green light treatments of 120,140,240 and 340 lx were significantly different from the control.The longevity of adults treated with 240 and 340 lx green light was significantly shortened,the maximum and average egg production per female was significantly decreased,and the oviposition duration was significantly shortened.Compared with the control,the hatching rate of eggs treated with different light intensities was significantly decreased with the lowest value of 17.00%.【Conclusion】The treatments with green light intensities of 240 and 340 lx significantly shortened the developmental duration of larvae and adult longevity,decreased eclosion rate,female fecundity and hatching rate,and thus inhibited the development of the population.It can be concluded that these two kinds of intensity green light can effectively prevent and control the E.grisescens warrn.