关键词: 烟蓟马, 趋光性, 单色光, 诱虫色板

Abstract:

【Objective】 The objective of this study is to explore the optimum light wavelength, light intensity and related factors, such as sex, daily rhythm, starvation time, temperature and relative humidity of Thrips tabaci through behavioral responses study under the different conditions of laboratory, greenhouse and field, and to provide a theoretical support for improving the control techniques and products of T. tabaci, such as color sticky cards and light traps. 【Method】 Firstly, the behavioral responses of T. tabaci to 10 different wavelengths of monochromatic light were conducted by using monochromator testing device with high resolution, wide spectrum measurement range and high stability under laboratory condition. Monochromatic light with high response rate was screened and the initial light intensity was attenuated by neutral density filter to explore the effect of light intensity on the behavioral responses of T. tabaci. Secondly, the effects of sex, daily rhythm, starvation time, temperature and relative humidity on phototaxis of T. tabaci were also examined by using the rate of phototaxis as statistical index. Based on laboratory experiments, using the relationship between Dan Bruton’s virtual wavelength and RGB values, the blue and yellow sticky cards of the corresponding wavelengths were printed and the plates were glued. The tendency of T. tabaci to the self-made sticky cards of different wavelengths and sticky cards produced by different manufacturers was evaluated in the greenhouse and in the open field.【Result】The results of laboratory experiment showed that phototaxis behavioral response rate was the highest on blue light at 450 nm, and the rate of photaxis was as high as 75.34%, followed by the yellow light at 562 nm and the blue-purple light at 430 nm, the rate of photaxis was 73.61% and 64.03%, respectively. Under the stimulation of 430, 450 and 562 nm monochromatic light, the phototaxis rate of female T. tabaci was higher than that of male. The light intensity attenuation test of the three monochromatic light showed that the tendency of T. tabaci increased with light intensity. At 8: 30-10: 00 am, the T. tabaci was most sensitive to monochromatic light at 430, 450, and 562 nm. After 4 hours of starvation, the phototaxis rate of T. tabaci was the strongest, and then decreased with the prolongation of starvation time. The phototaxis rate of T. tabaci to three monochromatic light was significantly higher than that of the control at 25-30℃. At 15℃, T. tabaci was not sensitive to monochromatic light stimulation. Under the relative humidity of 45%-60%, the phototaxis rate of T. tabaci was significantly stronger than that of the control at 430, 450 and 562 nm. However, there was no significant difference with the control under the relative humidity of 30% and 90%. The trapping effect on T. tabaci was evaluated by using different wavelength sticky cards and different manufacturers in the greenhouse and field, and the results showed that the blue self-made sticky cards and the No.2 sticky cards with reflection wavelength of 440-470 nm had the best effect. The results of this test were in agreement with the optimum wavelength of laboratory screening. 【Conclusion】 Sex, daily rhythm, starvation, temperature and relative humidity all have certain influence on phototaxis of T. tabaci. Comprehensive analysis on laboratory, greenhouse and field revealed that T. tabaci has obvious tendency to monochromatic light and sticky cards at 450 nm. The blue trap sticky card of about 450 nm can be used to monitor and control T. tabaci.

Key words: Thrips tabaci, phototaxis, monochromatic light, color sticky card