Now I am interesting in if any kind of light wavelength could usefully attract pests natural enemies like lady beetle, predatory bugs, hover fly, lacewing, or parasitoids. Could any one could tell me where could I find related research articles or messages. Thanks for your help!
Different insects can be attracted to light and also ultraviolet (UV) energy, but the specific wavelength regions to which they are attracted (or repelled in some cases) will differ species-by-species. More often than not, however, short-visible and near-UV wavelengths (
As John say, the response to lights or objects reflecting particular wavelengths depends on their biological meaning for a given species and also on the spectral range of sensitivity of the eyes. It is not possible generalising in terms as pests, vectors, or parasitoids.
Dear Dong,
Light does not attract insects. It only deceives them. Generally insects try to move – fly – right or straightforward. They use as a standard direction the light of the sun or moon. They keep a certain angle to the sun or moon-rays and so they can move straight. However, in case of artificial light source because of the small distance between the insect and light source the distance will continually change the angle and the insect will fly into the light of lamp. This is the mechanism of the light trap.
https://www.scienceabc.com/nature/why-are-insects-attracted-by-light.html
http://www.iflscience.com/plants-and-animals/why-are-bugs-attracted-light/
Thus, insects use light for navigation.
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