| The bean flower thrips, Megalurothrips usitatus (Bagnall) is a key restricted factor for cowpea production in Hainan. In the current study, RGB values and virtual wavelengths were converted each other based on Dan Bruton's wavelength to RGB function.Eight color papers were printed by color printer based on RGB values[(255, 255, 255), (97,0,97), (0, 0, 255), (0, 127, 255), (0, 255, 0), (129, 255, 0), (255, 255, 0), (255, 0, 0)] and were chosen to test the color preference of the bean flower thrips M. usitatus in an octagon maze,and their equivalent wavelengths were polychromatic light, 380 nm, 440 nm, 461 nm, 510 nm, 540 nm,580 nm, and 647 nm, respectively. The color papers with the spectrum of 440 nm (blue, with RGB values of 0, 0, 255) and 461 nm (cambridge blue, with RGB values of 0, 127, 255) showed highest attractiveness followed by 540 nm (chartreuse green, with RGB values of 129, 255, 0) and polychromatic light (white, with RGB values of 255, 255, 255). In addition, the light preference of M. usitatus was also indicated that blue LED (461 nm) was significantly more attractive than the other color LEDs. In total, the results suggest that blue series stimuli should be a crucial cue to attract M. usitatus, and blue sticky traps and/or light traps could be a useful device for monitoring and managing M. usitatus. |
