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Natural Fly Killer – A Zip Lock Bag of Water





With summer coming around the corner, the fly is standing in line to attack  everything that does not move, especially our dog. The natural fly killer is something we prefer more than a commercial fly killer, and are always looking for something that works to get rid of each and every fly within range of the dog kennels, patio, yard and inside the house. However, something we never knew existed was the  zip lock bag of water as an indoor fly killer and an outdoor fly killer. Not too long ago we received an email about a popular natural fly killer that costs about four cents -- depending on where you shop. After that,  it is history with the zip lock bag and a natural fly killer for our dog.

A zip lock bag of water as a natural fly killer?

At first, we were very skeptical of the idea of a zip lock bag of water used as a natural fly killer. Especially one that would cause flies to run for cover at such a low cost. But we thought to ourselves, “Why not?” With every rescue dog fighting them every summer, we felt a zip lock bag of water for an easy and natural fly killer was something we could afford and was safe for our dogs.  After all, we were not going to be out much for 4 cents if it did not work.

Photograph by Nancy L. Young-Houser

Photograph by Nancy L. Young-Houser

In the kitchen we hung three half-filled zip lock bags of water, with four pennies in each bag. There. We had our natural fly killer up  and were waiting for the flies to land — somewhere but on the dog waiting patiently below the zip lock bag to see what would happen next.

We had tied the closed bags with a twine and hung them (with most of the air removed) in varied corners in the kitchen, porch and outside patio. Within one hour, over 3/4 of the flies were gone. How it happened, we do not know. But try it yourself….do not take our word for it. You will be surprised. There are lots of natural fly killer methods out there, but none are as cheap as the zip lock bag filled with water and four shiny pennies at the bottom!

REVIEWS OF THE FLY REPELLENT BAG:

We went with some out of town friends to Sweety Pies on Sunday for breakfast, and we sat in the enclosed patio section beside the house. We happened to notice a couple of zip lock baggies pinned to a post and a wall. The bags were half filled with water, each contained 4 pennies, and they were zipped shut. Naturally we were curious!

Ms. Sweety told us that these baggies kept the flies away! So naturally we were even more curious! We actually watched some flies come in the open window, stand around on the window sill, and then fly out again. And there were no flies in the eating area! This morning I checked this out on Goggle. Below are comments on this fly control idea. I’m now a believer! ~ Deb

pennie_bag_1

Many people swear that a zip-lock bag filled half-way with water and attached over entry-ways will repel flies. No one yet knows how or why it works, but there is speculation that it has something to do with the way the moving water refracts light. If you have tried this please use the comments form at the bottom of the page to share your results with the rest of us. ~ Sue

October 5th, 2008

I did tried the ziplock bag and pennies this weekend. I have a horse trailer with full LQ. The flys were very bad this weekend while I was camping. I put the baggie with pennies above the door of the LQ. NOT ONE FLY came in the trailer. The horse trailer part had many… Not sure why it works but it does!!!!!!! ~ Ann

September 20th, 2008

Fill a zip lock bag with water and 5 or 6 pennies and hang it in the problem area. In my case it was a particular window in my home. It had a slight but significant passage way for insects.Every since I have done that, it has kept flies and wasps away. Some say, that wasps and flies mistake the bag for some sort of other insect nest and are threatened by this. ~  Danielle

June 7th, 2009

I swear by the plastic bag of water trick I have them on side porch ( our house entry) and all around the basement door. We saw these in Northeast Mo at an Amish grocery store & have used them since. They say it works because a fly sees a reflection & won’t come around. ~ Maggie

May 16th, 2009

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., they simply won’t take the risk of being around that much perceived action. 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. ~ Just DJ
(Submitted by Peggy Winter of Overton, NE)



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39 Responses:

  1. ART HARDWICK

    - 27th Sep, 09 07:09am

    I vacation in Myrtle Beach,SC for over 50yrs now.I first saw this at a diner about 15 yrs ago.The bags are still there.I guess it works.I don’t remember seeing any flies anywhere.
    ART H.

    Reply to this comment

  2. jpdaigle

    - 31st May, 10 07:05pm

    i seen this in victoria Tx at a resturaunt but i didnot know about the pennies so i will try it with pennies

    Reply to this comment

  3. jpdaigle

    - 31st May, 10 07:05pm

    also its a good time for for me to try it

    Reply to this comment

  4. ken

    - 21st Aug, 10 07:08pm

    i Gila Bend,Az in the dead of summer we stopped at an ice cream shop that had i plastic i gallon jugs hanging near the picture windows that surrounded the serving area.there was not a fly in the place.when asked the owner told us they had used this method for many,many years.this was 23 years ago.i have i gallon jugs hanging around my donkeys open pen.guess what.no flies.dont know why.it just works.

    Reply to this comment

  5. Criss

    - 31st Aug, 10 07:08am

    We’ve recently purchased a few acres in Farmersville TX and every outbuilding had old plastic bags hanging from string I knew there must have been something in them to repel flying insects because the property was previously used for boarding horses. I was pleasantly surprised to find it was just plain water and am in the process of replacing the old bags with new bags filled with water the only problem is in the low ceiling buildings like the chicken coop where our recently rescued Anatolian Shepherd likes to jump up and bite the bags. My son suggested using mini disco balls and I was wondering if anyone has tried using disco balls in place of the bags of water.

    Reply to this comment

  6. lavonna

    - 13th Sep, 10 08:09pm

    I don’t know what it is but i have been seeing these bags all over and didn’t want to seem dumb so i never asked why, until Labor day weekend. My family and I went to a BBQ which lasted all night. Needless to say flies and BBQ’s go hand and hand. I tell you we stayed outdoors until around 2am not one fly. I said WTF. Of course i now have bags at every entryway to my house. It’s to bad I had to find out the secret in Sept.

    Reply to this comment

  7. nostoc

    - 4th Jul, 11 06:07pm

    I was, and I guess still am, a doubter. We have a large family reunion every July 4 in a city park pavilion. With dozens of covered plates from just as many kitchens, you can imagine a hot summer day in Southeast Kansas becomes fly haven every year. This year I put up bags of water on three sides of the open pavilion. During the meal you could count the flies we saw on one hand. A couple hours later there seemed to be a couple dozen buzzing around the floor, but none on the tables or near the food. I suppose the refracted llight was not visible from the floor under tables. I still think this could be coincidence, but none of us remember a single year when we saw so few fliles. We’ll probably disprove this theory by trying it the next few years. However, if we go twp or three in a row, we might be convinced this thing works.

    Reply to this comment

  8. Donna

    - 11th Sep, 11 07:09pm

    We thought the plastic bag fly thing was just a joke to see how many people would do it. Well, we were camping on Lake Superior and lots of flys….lots. I remembered about the plastic bags and made four and attached them around our tent awning. NO MORE FLIES!!!! I am not kidding…and Northern Michigan flies are the toughest! We camped for 2 weeks and no flies.

    Reply to this comment

  9. Debbie C

    - 5th May, 12 10:05am

    We came home to a full house if flies, someone told us to do this but leave the bag open & it would catch them…needless to say, 4 days later…nothing & house still full of flies

    Reply to this comment

    • Cecelia

      - 22nd May, 12 12:05pm

      I think it is supposed to drive them away from the bag, not toward it to be caught.
      Also, was the room well-lit, to where (if it really works by light), the light would be able to shine through the bag? (maybe the color of the light matters, like white light from outside (or an LED) is better than just yellow light from a lightbulb. Was it hanging up? How did you manage to hang it up but leave it open?

      Reply to this comment

  10. bud W

    - 23rd May, 12 07:05am

    Flies are near bottom of the insect food chain and as such they are trying to avoid anything that reminds them of a larger preditor. Most of the preditors have large protruding eyes. So large shinney pennies reflecting a prizom of light is an easy explaination of why this works. I live on a boat and believe it or not I have no fly zone aboard the boat. It does not catch them. however they tend to stay clear of the area.

    Reply to this comment

  11. Rochelle

    - 2nd Jun, 12 10:06pm

    In my country it is done a lot. You don’t even need to put penny’s in de bags, just water works also. It is said that when the flies look at the bag with water, they will see a huge reflection of themselfs. This is whats scares them away.

    Reply to this comment

  12. Rebecca

    - 3rd Jun, 12 07:06am

    This works, a bug guy told me that the reflection of the bag and movement messes with the flies compound eyes and freaks them out.
    The pennies are in there to keep the water from molding.
    Usually they use silver coins but probably people might decide they want that coin.
    So, pennies are cheaper.
    Also, if you have a fan above tables or blowing from some side source, that keeps flies, mosquitoes, wasps and bees away because they don’t like to try to fly in the wind.
    The fog sprinklers also work but people at the tables get wet from all of the mist.
    When we have a party, I first spray the perimeter with the bug fog that drives them away. Then we put 2-3 fans blowing hard in the yard pointed at the decking and that helps a lot keeping especially the mosquitoes away.

    Reply to this comment

  13. Matt :P

    - 23rd Jun, 12 08:06pm

    The penny inside the bag HAS to be shiny, only because when the water makes the penny looks bigger because of magnification, the shiny-ness of the penny makes the fly scared because it makes the fly think it is bigger then them and they fly away. I learned this from a pastor from up the street from me :)

    Reply to this comment

  14. john hebert

    - 3rd Jul, 12 04:07pm

    Copper (penny), or silver (old coins) are both fantastic disinfectants. Algae cannot grow due to the metals dissolved in the water. I imagine that was the idea there. I’m using a couple crumbled up pieces of foil for reflection. Never heard of just water, but I haven’t had a fly in my house in days. I have 4 dogs and 2 cats. The house isn’t terrible, but if I drop food on the floor, I probably wouldn’t eat it. And still, NO FLIES. Not even in the bathroom, where they usually seemed to congregate. It works for some reason, probably an optical thing is my best guess.

    Reply to this comment

  15. wanda clagg

    - 30th Jul, 12 06:07pm

    we have bag of water with a few pennies over our front door outside the flies still hang out on the screen so i don’t think it is helping we even have one of those sticky fly strips hanging in the garage has a few flies on it the rest of the flies i think ignore it i know they are bad this yr we live in ohio

    Reply to this comment

  16. Marifel Baez

    - 27th Aug, 12 09:08am

    Accordig to my parents it has to do with their eyes, they have not one but thousands of mini eyes and those cant take the water/light effect in the bag. (We didnt use pennies)

    Reply to this comment

  17. Jeniffer Sterland

    - 2nd Mar, 13 08:03pm

    This is intriguing. Summer in Australia is a Great Convention for Flies! I’m just wondering what sort of coins I should use. I think I might have a couple of old Stirling-coinage pennies [copper], but where have I hoarded them … mmm?? When Decimal Currency arrived in Australia in 1964-5 we switched to ‘silver’ coins; 5 cent, 10 cent and 20 cent coins, with a later addition of a 50 cent coin. These are not actually silver. As the bag is sealed, I guess it is only a matter of light reflection, as no ‘odour’ would be released. I’ll see how I get on and report back, just in case there are other Aussie readers here. Or I would appreciate hearing from them if they’ve tried the idea.

    Reply to this comment

  18. LDScowgirl

    - 25th Mar, 13 09:03pm

    Can you use glass? Trying to make it look like a unique decoration instead of a random bag of water and pennies.
    For the same reason, could you use colored water?

    Reply to this comment

  19. Sandy Welte

    - 20th Apr, 13 01:04pm

    I haven’t used it at our place yet, but out west we saw them all the time out in the Sturgis area during bike week and asked what the bags for used for!! There were no flies!!

    Reply to this comment

  20. Brian

    - 18th May, 13 11:05pm

    I tried this, if fact I hung several on my patio abouve the table, while the flies did not just disappear they may have been reduced…IDK…the verdict is not in yet on this “fly killer”.

    Reply to this comment

  21. Mikki

    - 26th May, 13 06:05pm

    I recently remodeled our patio and have lovely flowers and water features that are so relaxing, never being able to use the outdoor room because of flies that come into the house. I have had a bag of water with pennies hanging on the patio and in the garage at the kitchen entrance and have not had 1 fly in the house since and it’s a miracle. Im not a fan of bugs, so this is fantastic. 2 months and no flies.

    Reply to this comment

  22. Lisa

    - 16th Jun, 13 05:06pm

    I just moved to a new house with a lot of fruit
    Trees and the flies were bad. I hung two bags
    In two different spots. The flies are still here but
    Not as bad!
    I live this bag-I-penny thing!

    Reply to this comment

  23. RoadHogs

    - 10th Jul, 13 01:07pm

    Does this work with misquitoes as well?????????????????????????????

    Reply to this comment

  24. Kenneth

    - 19th Jul, 13 11:07am

    Have tried this, Nebraska flies must be different, does not work!!!

    Reply to this comment

  25. Kathy

    - 4th Aug, 13 09:08pm

    It works! Just had hardwood floors put in and we had to leave the doors wide open for the workers and not one fly in!

    Reply to this comment

  26. Mary

    - 1st Dec, 13 08:12pm

    This really works!!

    Reply to this comment

  27. wshiwsnt

    - 7th May, 14 07:05am

    it doesn’t kill them-it repels them. reflection of pennies in the water repels them.

    Reply to this comment

  28. Paul Nicks

    - 7th Jun, 14 11:06am

    The problem with this method is that it keeps them away for mere seconds and the flies still exists. They need to be exterminated so that you won’t have to hang these gaudy bags all over the place.

    The very best fly repellent on the market is QuickBayt Fly Bait. They are red sugar granules that you can place on a plate that will attract the flies. It takes about 20 seconds for the fly to start spazzing out from the time they ingest the bait. They are dead within 60 seconds. The eliminate the flies, not just scare them off.

    Here is the cheapest source for the QuickBayt: http://bugrepellentzone.com/flies/quickbayt-fly-bait-fly-repellent/

    Reply to this comment

  29. Lake girl

    - 18th Jul, 14 11:07pm

    I live in central Alabama and around here a natural predator of flies are hornets. If you have seen a hornets nest it is a gray color and made up of chewed up paper. Anytime a fly sees a hornets nest they go they other way. The ziplock bag resembles a hornets nest therefore the fly leaves. We have used this trick for years down here and it works well.

    Reply to this comment

  30. Bev

    - 21st Jul, 14 05:07pm

    I used a bag of water and one penny today and it worked. We were outside eating and being pestered by flies. I rembered seeing the bags in Greece over the doors in restaurants. I put one up and in a matter of minutes, there were no flies. I am convinced.

    Reply to this comment

  31. dawn

    - 22nd Jul, 14 03:07pm

    okay well I tried this and it don’t work at all it doesn’t bother our flies they land on the bag and everything oh and the soap and water thing doesn’t work either

    Reply to this comment

  32. sherri

    - 7th Aug, 14 06:08pm

    My family and I hung sandwich size Ziploc bags over all our Windows and doors and it worked! We saw this technique in a restaurant. I had now idea about using tin foil or pennies. So, it seems that it worked without either technique. Have a blessed day!

    Reply to this comment

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