Studies on the Phototropic Behavior to LED Light of Six Stored Grain Insects

Abstract

Light trapping is an environmentally friendly pest insect monitoring method. Deeply understanding the influence of different wavelengths and light intensities of light source on the phototaxis of stored grain insects is very helpful for improving light trapping effectiveness. Thus, the phototaxis of adults of Sitophilus oryzae (Linnaeus) (Coleoptera: Curculionidae), Tribolium castaneum (Herbst) (Coleoptera: Tenebrionidae), Lasioderma serricorne (F.) (Coleoptera: Ptinidae), Cryptolestes ferrugineus (Stephens) (Coleoptera: Laemophloeidae), Tribolium confusum (Jacquelin du Val) (Coleoptera: Tenebrionidae) and Sitophilus zeamais (Motschulsky) (Coleoptera: Curculionidae) to LED lights of different wavelengths and intensities were investigated in laboratory, respectively. The results showed that S. oryzae adults had the highest phototactic ratio (81.11%) to LED lights with a wavelength of 590 nm and a light intensity of 170 lx. T. castaneum adults had the highest phototactic ratio (92.22%) to LED lights with a wavelength of 520 nm and a light intensity of 120 lx. L. serricorne adults had the highest phototactic ratio (77.78%) to LED lights with a wavelength of 460 nm and a light intensity of 170 lx. C. ferrugineus adults had the highest phototactic ratio (93.33%) to LED lights with a wavelength of 365 nm. T. confusum adults had the highest phototactic ratio (84.44%) to LED lights with a wavelength of 460 nm and a light intensity of 120 lx, and S. zeamais adults showed the highest phototactic ratio (88.89%) to LED lights with a wavelength of 365 nm. These results have reference value for effectively designing integrated pest management (IPM) strategies utilizing the phototaxis of stored grain insects.

Keywords

• stored grain insects
• phototropic behavior
• led lights
• phototropic devices
• wavelength
• intensity of light