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Fly traps are an ancient solution to the fly problem. Surprisingly not used as much today. You have a fly problem and the usual response is to grab a can of poison. The main problem with poisons are that they kill not only the bugs you want dead, they also kill the ones you might like to keep alive, not to mention the idea of yourself or loved ones coming into contact with them.

Over the thousands of years Humankind has dealt with garbage and other wastes, they have had to deal with the biological duties of Flydom. Though flies are dirty and carriers of disease, the world would be buried in crap and carcasses if it weren't for their intervention. However, they carry disease and are really dirty, so control is an issue.

Some of the earlier controls were to take a certain poisonous mushroom and float it in milk, stinky baits with a similar funnel setup, sticky traps, and the Dog. These forms are not pragmatic for whatever reason, the dog gets full, it takes days to get the stink just right, the stink is stinky, and lack of mushrooms come to mind.

This trap is pleasant enough to keep in the house and works much better, is more efficient, than any of the other methods commonly used.
 
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Step 1: Fly Behavior

smilinjak.jpg
Before we can defeat our enemy, we must understand his habits. Besides being attracted to feces, garbage, and unwashed individuals, flies are just plain too fast to catch. In that devious little brain lies all the factors that have kept him and his ancestors to the Nth degree in business. So to defeat him we must study him.

The easiest way to do this is to find a big pile of dog crap in the yard and watch it closely. This is a great activity for the family and friends over a few beers during a cookout. We usually cut out little fly wings for the kids and play games like "catch the fly" where one of them takes off making buzzing sounds and have all the other kids chase after them with nets. The dogs join in and it's just fun all around. Anyway, if you watch long enough you will start to see things like me, and realize that when flies get done with whatever they do there, they do two things:

1) They fly straight up.
2) They go towards the light.

See, when flies handle their sacred (Sacred to Flies. What did you think I meant?) functions in the great scheme of life, they seek out stinky dead things all over. If it happens to be in a tight place, they crawl around following the smell until they get to the spot they need to be. Getting back out is a little harder, because in an enclosed space they can't smell anything but stinky, so follow the light. Now you know why they always seem pretty stupid about realizing they can't get out THROUGH the window glass.

The other problem flies have is nobody seems to think of them as pets. Either somebody is trying to eat them, or just plain doesn't like them for some reason. Understandably, they have a real persecution complex, so over the millions of years they've been in existence have developed these paranoid responses which, noting their habits, have worked out pretty good for them.

Beyond the fact that his egress is not likely to be down and under that pile of poop, the most vulnerable time for our leetle friend is when he's taking off. Considering the shortest distance between two points is a straight line, getting airborne is simply a matter of getting there fast. Now catch him.
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cammosutra says: Apr 3, 2013. 5:14 PM
Several thoughts on this topic.

I used to own a store bought flytrap made from a canning jar lid, a disk of screen with a small hole in lieu of the metal lid, and a small plastic cylinder with a hole that fitted thru the hole on the screen. I think the hole was drilled or molded onto a "T" shape. I put some dog stuff in it, screwed on the lid, and it worked like a charm.

When Dad was on Saipan in WW2, he told me they made industrial size fly traps there because the flies were so bad after the invasion. I thought he was joking and about a hour later we were finishing a homemade fly trap with some scrap screen and two 1x10 chunks of wood. The wood held a length of screen shaped like a arrowhead with small holes in the apex of the "shaft" end of the arrowhead. Placed over bait the flies flew through into the screen enclosure through the holes. A small length of wood sealed the two screen ends at the "point" of the arrowhead. It worked very well. It remains a great memory of father/son bonding for me.
jjoines says: Oct 26, 2012. 10:46 AM
if you have some sort of insectivore you could either channel them to his enclosure or do what others have suggested and freeze them. Revenge is best served cold?
Hippykidz says: Aug 7, 2012. 11:38 AM
Thanks for the design. I use cellophane and a wine glass for fruit flies but didn't know what todo for house flies. Off to my shop I think I have everything I need except the right bait. Hmmmm? what to use, what to use............?
AtlantaTerry says: Jul 26, 2012. 1:40 PM
My late father was a carpenter and made many fly traps for friends out of:

* four long pieces of wood about 1/2" square and a foot long
* one piece of wood notched to fit and secured about 1/3 of the way up
* a fairly large hole cut in the piece of wood
* form a funnel with window screen to fit over the hole
* secure the screen funnel with staples, glue, etc.
* fray the tip of the funnel so flys can squeeze thru the fibers but not back out
* wrap window screen around the four sides
* make a "cap" of window screen

To use: stand the trap over bait out in the yard: fresh dog poop, a chunk of an ear of corn, some rotten food, etc.

As mentioned in the article, flys like to depart from their "lunch" by moving straight up. When they do they enter the funnel on a one way trip.

To empty remove the cap, dump the dead flies then replace the cap.
kidsleepinfo says: Apr 18, 2012. 10:37 AM
You spent a lot of time trying to be funny and informative about fly behavior, and next to none explaining and providing pictures about how to make the trap. I have an M.D. degree and after reading your instructable, I'm at a loss as to where to start. I'm not even sure about the light thing, although I guess by painting one part black, you expect the flies to go the other way. It looks like it might be a good set up, especially if, as you say, the trap doesn't smell like some others tend to, but you didn't address that either. Sorry if I'm being negative, but I would have liked to make this trap.
CapnChkn (author) in reply to kidsleepinfoJul 15, 2012. 10:16 PM
It's not brain surgery! Maybe you need to be a farm boy! Here's a comment from 2007:

Ouroboros439 says:
Well CapnCnkh it did not take me long to make mine and for a try out I took it to my uncle's dairy farm.  He has asked me to make him 10 more, I think it worked.  Thanks A Lot


It's the same basic funnel trap used for thousands of years with a jar for a cage.
RA_1234 says: Jun 30, 2009. 9:05 PM
What was used for bait?
CapnChkn (author) in reply to RA_1234Jul 1, 2009. 12:37 AM
You have just asked the most often asked question! In actuality, I get mine from an old Thunderbird in the Black Hills of South Dakota. The flies seem to really like that CRAP. I don't know what's in it, but when I visit the cave I find pots of simmering SPAGHETTI SAUCE, old cans of TUNA FISH, jars of PEANUT BUTTER, and LEFTOVERS FROM HIS REFRIGERATOR. I've tried to find what the flies are into out there, but of course there aren't any flies around, or if they are there, there aren't any CARCASSES or OLD BONES laying around for them to get into. I actually think he takes the tears and sweat of old cows and horses that are too old to actually make a living in the normal way and distils a liqueur using stuff like OLD BREAD, BEER, SWEATY SHOES, URINE, SWAMP MUCK, ETC. I mean, I'd like to help you there, but he won't give me his address, won't answer my calls, it takes all I got to get him out of the place when I go up to visit. Sorry buddy. By the way, any of you know Jeanie? Hi Jeanie! I love you too!
feistyjournalist in reply to CapnChknJul 6, 2012. 10:10 AM
Thank you for your fly trap design. I appreciate the work you did to make it and post it. That's about all the nice stuff I can say to you. It's less insulting to your audience if, in your comments, you don't try so hard to be a tool, though.
CapnChkn (author) in reply to feistyjournalistJul 15, 2012. 9:55 PM
I admit the comment is snarky.  How many times can you be asked what you use for bait?  If you have flies crawling on your food, would you think to yourself, "Geez, I need some fly attractant from the Farmer's CO-OP to catch these guys, cause it's the ONLY thing that works?"

This 'ible is about how to make a fly trap, not how to catch flies.   What kind of flies are you trying to catch?  I would say if you're trying to catch carrion flies, use meat.  If you're trying to catch houseflies, use the leftover spaghetti.  What did I use for bait?  What the flies eat!
chuckr44 says: Jan 18, 2012. 6:53 AM
This trap will work for several species of flying pests.
- Fruit flies like sugar water (soda or fruit juice)
- Yellow jackets like sugary things in early summer, protein (rotten meat) in late summer.
- House flies prefer, well, any rotten food.
- I wish I could catch horse flies and deer flies, but they prefer live animals.
jsangiuliano says: Oct 20, 2010. 1:36 PM
Or you can buy Phermone at Walmart.
chuckr44 in reply to jsangiulianoJan 18, 2012. 6:51 AM
There are no pheromones for house flies, but they have pheromones for yellow jackets, a type of wasp, and Japanese beetles.
bodie says: Oct 7, 2010. 11:02 AM
My trouble was with fruit flies, so I made a couple of small changes. I used a plastic water bottle and cut off the top of the bottle and inverted it. This made its own funnel. Then I attached the whole assembly to a small rectangular plastic baby food container. This made the whole assembly small enough that I could sit it on the window sill and my wife didn't mind it.

I colored the outside of the baby food container with a black sharpie and I used a blackberry to bait the fruit flies. I also found that a slit was too big of an opening, and the flies flew back out of it. Instead, pushing the tip of a ball-point pen through the side of the container made the opening just right. I caught HUNDREDS of flies with this thing.  Great 'ible.
shveet says: Jul 21, 2010. 5:21 PM
if they fly straight up... then why do they fly around my head?
RetroTechno says: Jun 29, 2010. 1:29 PM
5 stars for not only being really inventive, but also really well written. With the 4th of July holiday coming up, maybe I will make one of these to entertain my friends at our cookout. Muhahaha! Coming to the comments late, I don't know what sabarblatoe wrote, but I'm guessing that he/she couldn't read the text in that big pink box below the commenting area about being nice.
Nicholai says: Jun 29, 2010. 11:04 AM
you could add honey tothe inside of the jar to make even more flies want it and come in and then laugh at their feeble attempts at escape muah-hua-ha--ha-ha
mandibug0218 says: Jun 28, 2010. 3:40 PM
Just made my first miniature fly trap .. Hoping it helps with this sudden invasion. Thanks for the instructable.
goobyalus says: Jun 28, 2010. 2:11 PM
We always just took an empty soda bottle, cut the funnel-shaped top off, inverted it, and taped it on. If the leftover soda wasn't enough bait, we added something sugary. Flies would go down the funnel and not figure out how to get out. This seems a little complicated for a fly problem.
Joe22c says: Nov 29, 2009. 4:11 AM
haha, I appreciate your subtle sense of humour throughout the guide:

"[poisons] kill not only the bugs you want dead, they also kill the ones you might like to keep alive, not to mention the idea of yourself or loved ones coming into contact with them."
theyoweusaliving says: Jun 30, 2009. 6:17 AM
Yesss. Finally some justice to this method of fly catching, been using this (or a very similar setup) for years and it has never failed me. One point of advice from personal experience by the way is that if you're dealing strictly with a fruitfly invasion in your house rather than with full size house flies, you can simply wrap a piece of paper into a funnel shape with the widest portion slightly larger than the mouth of a glass. Drop something sweet that can rot in the bottom of the glass, drop the funnel over top and make sure there's no clearance between the mouth of the glass and the funnel. That alone will be enough to take care of your whole fruitfly problem I've discovered. ...They are significantly less intelligent than most insects you will deal with. Added bonus is you can take them all outside when it starts filling up and let them go without killing them if you refrain from doing such things for any reason.
bitterbug in reply to theyoweusalivingSep 8, 2009. 3:13 PM
Fastest way I've found to kill fruit flies is vinegar and soap in a glass. Leave overnight and harvest all the little corpses the next morning.
deusexmachina says: Jul 8, 2009. 7:51 AM
I Love the instructable. I Love the GIF even more. Wow, I've heard of army ants, but this is the first time I've encountered a guerrilla fly. B)
Javin007 says: Jul 7, 2009. 4:02 PM
LMAO! Okay, I gave you 5 stars for the ending gif alone.
racecitync says: Jul 6, 2009. 1:52 PM
They aren't that difficult to catch by hand...maybe I'll do an instructable! lol
MillenniumMan says: Jul 3, 2009. 11:53 AM
There is a commercial product exactly like this called Flies-Away. It's one of the last ADs that Billy Mays did, maybey a couple months ago.
http://www.asseenontvguys.com/index.asp?PageAction=VIEWPROD&ProdID=857

Good to know that someone's patented a three-thousand year old idea and claimed it all for himself.
arirang777 says: Jun 29, 2009. 12:19 PM
OMG! I didn't know about the rambo fly you were able to spot. Maybe a new species developing around nuclear plants. One question, Cptn: Will you get only flies or also some other flying insects like bees, lady bugs, lacewings. wasps, etc. My neighbour got some traditional nectar traps but they caught EVERYTHING, so for the last few years we had have terrible infestations of aphids in everything with sap/green. I want to evict flies, not the good guys. Thanks!
CapnChkn (author) in reply to arirang777Jul 2, 2009. 6:53 AM
Oh! I hadn't noticed the question until now. Actually I get teh Woof spiders. They look so cute and everything when they're looking at the flies in the jar and so on, but you know how it is. Every so often one of them gets in and then it's problems getting them out. I usually try to chill them before they freeze, separate, and block freeze the rest of the biomass. I have, on occasion, caught Cockroaches, I get Ants by the handful, and once caught a Black Soldier Fly. If you set the space in the slots to "Fly Size," you strain out the big ones, use of food as bait instead of say, Jelly Doughnuts, keeps the endangered bees out of the mix, Etc. So to summarize. If you bait your trap with a horse, you will get horse flies. If you bait the trap with Elephants, you will catch Elephant flies.
wazzup105 says: Jun 30, 2009. 12:19 AM
. Neither sleet, nor rain, nor gloom of stormy night shall stay these disease ridden and filthy couriers from the swift completion of their appointed rounds.

poetry !

(I admit I bought a commercial fly trap but boy does it deliver.. Yesterday it was so full, flies were lining up outside waiting for to get in. If you think 1 fly is scary, wait till you have to remove a cup of dead flies from the device.)
CapnChkn (author) in reply to wazzup105Jul 1, 2009. 12:55 AM
Thank you! I'm a frustrated poet but don't know it. I actually saved all my flies for a week and had a half a 12 oz peanut butter jar full of the things. I had to throw them out though, cause they got flies in them. Once when I used some old food from a closed container, I captured in one day, I guess, around 1000-1500 of some species with big red eyes.
CapnChkn (author) in reply to CapnChknJul 1, 2009. 3:55 PM
I meant an Eighteen ounce jar formerly used to hold Peanut Butter.
jimyb5 says: Jul 1, 2009. 3:16 AM
Looks like a bird I was with last weekend...
miiwii3 says: Jul 1, 2009. 2:25 AM
this is great if you own horses! like me and my friend.
lemminggenocide says: Jun 29, 2009. 6:54 PM
Before we can defeat our enemy, we must understand his habits. Besides "being attracted to feces, garbage, and unwashed individuals, flies are just plain too fast to catch. In that devious little brain lies all the factors that have kept him and his ancestors to the Nth degree in business. So to defeat him we must study him. The easiest way to do this is to find a big pile of dog crap in the yard and watch it closely" hahahahahahahahahahahaha! Every time I read this, I imagine that it is being said by an old english man, and I can't stop laughing.
Lintballoon says: Jun 29, 2009. 4:34 PM
Yes, wicked cool picture!
Skaterp1 says: May 23, 2009. 5:15 PM
I didn't know flies had teeth.
vv00dy says: May 10, 2009. 5:11 AM
Good and simple. I like it. I think I'll catch and release spiders into mine. Yes I have a name for my fly trap, I call it the Octagon.
CapnChkn (author) says: Mar 30, 2009. 5:21 PM
HaHaHa!!! I don't know if I can find the picha of that old dude (Google Toothless...) I got the toothless smile offuv. Smilin Jack is just about the way I look nowdays... Cap'n!
dodo91 says: Feb 18, 2009. 9:11 PM
GROSS picture, but COOL at the same time! =b
RedneckAsian says: Jan 29, 2009. 1:16 PM
about the flies mouth:O_o
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