波长、密度和光强对黏虫趋光行为的影响

为提高灯光诱控黏虫Mythimna separata的选择性与效果，采取成虫趋光反应行为试验箱分别测定14种单色光波LED灯下、不同试虫密度下及不同光强下黏虫的趋光行为。结果表明：在18：00—21：00时段，不同光照时间下，试虫密度为20头时黏虫成虫趋光率最高；在光强为40~640 lx下，光强对黏虫成虫趋光率无显著影响，当光强为160 lx时，黏虫雌、雄成虫趋光率最高，分别为52.0%和27.6%；在365~660 nm波长范围内，雌成虫的趋光率显著高于雄成虫。当波长为420、590、600、630和660 nm时，黏虫雌成虫的趋光率较高，分别为41.0%、40.0%、41.0%、40.6%和45.0%；当波长为365、380、445和480 nm时，黏虫雌成虫的负趋光率较大，分别为33.6%、24.6%、20.0%和20.6%；当波长为570、590、630和660 nm时，黏虫雄成虫的趋光率较高，分别为33.6%、32.4%、30.8%和33.2%；当波长为365、590、600和630 nm时，黏虫雄成虫的负趋光率较大，分别为21.2%、20.2%、21.8%和21.2%，表明黏虫趋光行为主要受波长影响，且雌、雄成虫敏感波长不同。

Effects of wavelength, density and light intensity on phototactic behavior of oriental armyworm Mythimna separata

In order to improve the selectivity and effect of light-trap technology for oriental armyworm Mythimna separata, the phototactic behavior of adult M. separata under 14 monochromatic LED lights, different insect densities and different light intensives were measured in a phototactic behavior test chamber.The results showed that the phototactic rate was the highest when the density was 20 heads per box under different duration of illumination from 18:00 to 21:00. At 40-640 lx, the light intensity had no significant effect on the phototactic rate of M. separata. When the light intensity was 160 lx, the phototactic rates of female and male adults were the highest (52.0% and 27.6%, respectively). The phototactic rates of different sexes were significantly different when the wavelength ranged from 365 nm to 660 nm. When the wavelengths were 420, 590, 600, 630 and 660 nm, the phototactic rates of female adults were higher (41.0%, 40.0%, 41.0%, 40.6% and 45.0%, respectively); when the wavelengths were 365, 380, 455 and 480 nm, the photophobic rates of female adults were 33.6%, 24.6%, 20.0% and 20.6%, respectively. When the wavelengths were 570, 590, 630 and 660 nm, the phototactic rates of male adults were higher (33.6%, 32.4%, 30.8% and 33.2%, respectively); when the wavelengths were 365, 590, 600 and 630 nm, the photophobic rates of male adults were 21.2%, 20.2%, 21.8% and 21.2%, respectively. The results suggested that the phototactic behavior of M. separata was mainly affected by wavelength, and the sensitive wavelengths of male and female were different.