Effects of Spectral Light Factors on the Phototactic Response of Frankliniella occidentalis (Thysanoptera: Thripidae) Using LED Source

Abstract

Frankliniella occidentalis (Thysanoptera: Thripidae), also known as Western flower thrips, is a serious pest. It is necessary to further study its sensitive ranges response to light, to further investigate and realize the light induced prevention and control. In this study, the adult thrips were collected and used as material, the experiment was carried out with 560, 520, 405, 365 nm LED single and combined lights at 7000 and 14000 lux were used as light sources respectively, and the visual response sensitivity of thrips under different conditions was measured. The results showed that, thrips were more sensitive to 365 nm single light compared with that of 365 and 405 nm combined lights at 7000 lux. Their visual sensitivity increased under 405 with 365 nm combined lights at 14000 lux, while that under 365 with 520 nm combined light was the most sensitivity, suggesting that it was related to the energy intensity of light, and the photo-electrical-thermal effect caused by LED. In conclusion, thrips sensitive specificity of light wavelength was the reason of thrips visual sensitivity to light, and it was also related to the energy intensity of light. The results provide technical support for the development of light induction control equipment for thrips pests.