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In theory, refraction can be just as confusing for some species of insect, especially the housefly. It boasts a highly sensitive array of eyes which allow it to see in multiple directions at once. The insect's head mostly consists of a pair of large complex eyes, each of which is composed of 3,000 to 6,000 simple eyes. These eyes can't move or focus on objects like human eyes, but they provide the fly with a mosaic view of the world around them. Each simple eye provides one small piece of the puzzle, much like the way a screen's pixel delivers one detail of the larger picture. A housefly bases its sense of direction on the direction sunlight comes from. Some entomologists believe that when these complex, sensitive eyes experience refracted light, the insect becomes confused and flies away.
If all the factors are not taken into account, hanging water bags used to repel flies may seem to work due to the placebo effect. In medical terms, this is when people who think they're being treated for a condition feel better, even if that treatment treats nothing at all. The same effect could occur for people who think they are treating a pest problem. But what if the situation is even worse? What if the placebo actually increases the problem being treated? When Mike Stringham, professor of entomology at North Carolina State University, investigated the use of clear plastic water bags as a fly deterrent, he encountered just such a situation. Stringham conducted a 13-week field trial by installing commercial, water-based optical fly repellants on two egg farms. Stringham measured the fly activity based on the spots of regurgitated material the flies left after feeding. He concluded that areas equipped with water bags actually experienced higher levels of housefly activity.
However, the study was not conducted under natural lighting conditions. Its purpose was to determine whether the water bags could be used to decrease fly populations on egg farms. The study didn't explore the possibility that direct sunlight increased the water bags' efficiency.
Originally posted by DAVID64
reply to post by Rodinus
I've got one of those too. Love that zzap. [ evil chuckle ]
Originally posted by DAVID64
reply to post by Rodinus
I have to be very careful what I sit out as insect repellent. I have 3 dogs that are very curious and will taste of, if not outright eat, just about anything they find that even remotely resembles food. This might be worth a try, I could hang it from the trees. Them being Great Pyrenees, they can reach pretty high.