A Simple Mosquito Trap Using A 2-Liter Bottle, DME,…

It is summertime and that means spending time outside enjoying your favorite craft beer is a must.  However, there is nothing more frustrating than cracking open a beer and immediately realizing you are being eaten alive by mosquitoes or that damn fly will not stay out of your beer!  As a homebrewer I spend a lot of time brewing and drinking beer outside.  Did you know that studies have shown drinking beer increases your mosquito sexiness by 15%?  Did you know a mosquito can smell that CO2 being released from over 50 feet away?  The solution:  FERMENTATION.  This is how I keep those nasty insects away from my happy time.  I have noticed this works for many insects including mosquitoes and flies.

Supplies Needed:

  • Scissors or A Utility Knife
  • Empty 2-liter bottle
  • 1 Cup DME (Dry Malt Extract) or Brown Sugar
  • 2 Cups of water
  • Baking Yeast
  • Black cloth
  • Insects to kills
1. Find an empty 2-liter bottle


2. Cut the bottle into two parts. You will want the bottom portion to be slightly larger. 60/40 should do it.


3. Put the two pieces together like this. You will want room at the bottom for some liquid.  The hole inside is where the insects make their way in.


4. Add 1 cup of DME (brown sugar will work too) to 2 cups of really hot water
Bakers  Years
5. Add some baking yeast to your concoction. Baking yeast works better in high heat and creates more carbon dioxide. Insects are attracted to the CO2 gases released when the yeast attacks the sugars. If you are in a pinch and the temperature isn’t too hot, you can use brewing yeast.


6. Your mixture should look something like this and should contain the DME, yeast, and hot water.
7. Add your Mosquito cocktail to the 2-liter trap like this.
8. Wrap the trap in something black. Mosquitoes and most other insects are attracted to black. I used weed cloth which seems to work well.  You are done!  Now sit back and wait!
If your trap looks like this one…move!



How To Build A Simple Homemade Stir Plate

If you are searching for a way to bring your homebrewing to the next level, it is time to build a stir plate. A stir plate has one simple purpose…stir like a boss. There are plenty of commercial grade stir plates out there for $40-$200. That is nonsense and keeps you from enjoying the second best thing about homebrewing, building stuff.

To maximize yeast, it is essential to make a starter.  This will help the yeast get a head start and ferment better and faster.  If you have no idea what a yeast starter is,  Google it and return to this page afterwards.

What do you need?

  • A cigar box or project box
  • A rare earth magnet from a hard drive
  • PC cooling fan (these are everywhere)
  • Universal AC/DC power adapter
  • Super glue
  • Craft beer to drink
  • Electrician tape or Solder
  • Rubber rings
  • On/Off switch
  • LED power light
  • Rheostat
  • Stir Bar
  • 1000ml or 2000ml Erlenmeyer Flask or A mason jar works as well

Here is a lame video that I made (after drinking three cans of Resin) showing the different parts and the wiring in my homemade stir plate.  I am NOT an electrician and there is probably a better way to do the wiring.  There are also way better stir plates out there you can buy or even make.  Well,  my plate works and it works damn good.  That is all that matters.

You will need a rare earth magnet. These can be removed from an old hard drive. Just look for this piece and remove the magnet attached to it. Be careful, these will break and need to be removed using something flat with a large base. Pry them off.
Glue the rare earth magnet to the top of the fan with the center that spins. Make sure it is centered very good. Test it out before applying the super glue.<br />Some people hang the fan from the inside of the box with screws. I attach rubbed feet to absorb some of the vibration and it allows the magnet to be close to the stir bar.<br />Glue This to the bottom of your box lid.
Close up of rubber ring.
On/Off switch and LED power light. You will want to solder these connections or use connectors.
On/Off Switch and LED power light
Run the positive from the AC/DC adapter to the On/Off switch and then to the middle of the Rheostat. You will also want to connect the positive wire of your LED to the On/Off switch too.<br />Hook up the negative of the AC/DC adapter, the LED light, and the Fan together and seal the connection. You are done with the negative wires.
Hook up the positive wire of your fan to one of the outside connections of the Rheostat and solder. Wiring is done.

If you did everything correct, it should fire up and function properly. Make sure the rheostat is not hot when you touch it. I made the mistake of crossing one wire incorrectly and it got very hot to the touch.

Good luck on your build and I hope my half assed tutorial helped!