Summary of eRumor: Ziploc bags filled with water and pennies can be used to keep flies away. This rumor has been circling the web for years, and people have been using it to scare away flies for even longer. The idea is that flies have poor eyesight, and water-filled bags create some type of optical illusion that scares them away. The most common version claims that light refracted in the water confuses the flies.
I have a horse trailer with full living quarters. The flies were very bad this weekend while I was camping. I put the baggie with pennies above the door of the LQ.
The horse trailer part had many. Not sure why it works but it does!! Maggie: I swear by the plastic bag of water trick. I have them on side porch our house entry and all around the basement door. Just DJ: Regarding the science behind zip log bags of water? My research found that each of the millions of molecules of water presents its own prism effect and given that flies have a lot of eyes, to them it's like a zillion disco balls reflecting light, colors and movement in a dizzying manner.
When you figure that flies are basically prey for many other bugs, animals, birds, etc. I moved to a rural area and thought these "hillbillies" were just yanking my city boy chain but I tried it, worked immediately! We went from hundreds of flies to seeing the occasional one, but he don't hang around long. Can you put the pennies in glass jars. I have done plastic bags for years and it works. Marge days ago. I read an article that said flys have a certain type of vision that enhances things so to speak.
When they fly towards tbd bag of water, the pennies or my mom used nicked, bystanders what they see from the reflection of the water and light bouncing off the mo eye is a big huge wall of water and of course they fly sassy it to them they will drowned.
It had something to do with the flys eyesight though. Veronica more than 2 years ago. Flies do not leave an area because of a bag of water. Zero, and I mean zero, scientific evidence. These bags are equally effective for keeping away zebras. Mikey G. Worked at my old house my brothers house had way too many and it work there and now at my new place.
Bob Blob more than 1 year ago. I just now finished putting 2 nickles and 2 pennies in a quart size bag, set it on the window sills, all the floors disappeared so far anyway. I'll let y'all know if it stops working.
Tammy Shuler more than 1 year ago. You may want to take advantage of spellcheck. No idea what a lot of your post said. I read this a long time ago but I never tried it. I finally got sick of the smelly traps and tried it. It really reduced the amount of flies, pretty crazy! Peter Meshkowitz more than 2 years ago. I guess they will never leave, since they will not go near the entrance where the bags are hanging.
Greg more than 2 years ago. I say it's the pennies with the copper putting out an emf that deflects the flies. Angel Wheaton more than 2 years ago. In Aussie we dont have copper penn iies. Will any type of coin ie nickel plated suffice? Lee more than 2 years ago. Wonder if empty plastic water bottles would work William Storm more than 3 years ago.
Pennies are made from a copper-zinc alloy which will not corrode. Tape the top of the bag to the outside of your door. Replenish the water as needed. It is not clear why these water bags repel flies, but they do. I have gotten a ton of mail from all over the world when this column originally ran and the mail ran 9 to 1 saying this method worked. You may also get some questions from visitors as to why you have a Ziploc bag of water on your front door.
Some possible answers are: It attracts flies. It scares flies. If it boils, we know it is hot outside. When you drive around town, look for Ziploc bags on doors and you will know who reads this column.
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