Phototactic Response of the Rice Weevil, Sitophilus oryzae Linnaeus (Coleoptera: Curculionidae), to Light-emitting Diodes

The phototactic response of the rice weevil, Sitophilus oryzae (L.), to light-emitting diodes (LEDs) at five different wavelengths and various light intensities was tested in an LED-equipped Y-maze chamber, and compared with its response to a luring lamp, which is used in commercial traps. Blue (84.3%) was the wavelength most attractive to S. oryzae, followed by green (74.3%), red (64.3%), UV (63.3%), and IR (48.7%). Moreover, blue and green wavelengths were 1.5 and 1.3 times more attractive than luring lamp (56.7%), whereas the UV wavelength was slightly less attractive to the weevils than luring lamp. These results suggested that blue and green wavelengths could be more useful than those currently used for monitoring and mass trapping of S. oryzae.