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March 31, 2011


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anthony stewart

I would think that if a bug could not see yellow, that the yellow light would not be bright and thus suitable for not attracting bugs in the dark and the Prestone container would appear black in bright day-light and thus stand out.

As I recall many insects are attracted to dark clothing in bright light and Prestone does not make a black container.

Perhaps the color is a coincidence and the key ingredient is a large container with the sticky jelly and dark appearance blocking yellow is a secondary attractant from the bug's eye.

Randall Brynsvold

Most insects can see yellow, but are more sensitive to the blue-violet-ultraviolet end of what we consider to be the visual spectrum. Generally, flying insects see blue-to-UV light as "brighter" and more attractive. Hence the blue-to-UV lights in insect traps and bug zappers. Yellow lights are less attractive because they appear dimmer to insects, particularly if there are other non-yellow lights in the neighborhood (or a full moon). I think you'd have to get down into the red end of our visual spectrum before you'd have a light that insects couldn't see. Some moths are attracted by by infrared emitters, but I think that's sensed by the antennae and not the eyes.

Whiteflies just seem to have a particular "thing" for landing on yellow surfaces. Maybe they can't differentiate between yellow and pale green, and prefer to land on the undersides of leaves (which are lighter colored than the upper sides). I don't think they are active at night.

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