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Picture of Carpenter Bee Trap, Small Version
Bees.JPG

This easy trap will help control carpenter bees that threaten your home without the need for baits or poisons, and it will not attract or harm any other kind of bee or insect. The trap will not lure carpenter bees in from a great distance, but will trap those that are intent on damaging the protected structure. Wood-boring female carpenter bees enter the pre-made holes, then they become dessicated by the sun in the capture bottle. The first day this trap was installed, it caught the four bees shown in the photo.

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Step 1: Components

Picture of Components

There is nothing special about the components and their dimensions. Feel free to substitute, though I would not use plywood for the sides of the box because its exposed glue might deter the bees.

Wood for box, solid, one inch thick, 4 inches wide, does not need to be weathered

Wood for box lid, I used a scrap of 1/4-inch thick marine plywood 4 and 3/8 inches square

4 drywall screws for attaching lid to box

wood glue for outdoor use, such as Titebond II, to assemble the wood box, or alternatively drywall screws

Rectangular plastic 500 ml Fiji bottled water bottle and its cap (WalMart). This is the only rectangular bottle I could find, and it is sturdier than most other water bottles.

Deer Park Aqua Pod 325 ml plastic bottled water bottle and its cap (grocery store).

Metal grommet for connecting the bottle caps together, sold as part of a kit for placing grommets in tarpaulins; alternatively, outdoor tape

Step 2: Make the Wood Box and Drill Entry Holes

Picture of Make the Wood Box and Drill Entry Holes

The box is four pieces 4 inches high by 3 and 3/8-inches wide each joined using only wood glue and clamps. Connecting the pieces together in a spiral configuration allows all four pieces to be the same size. These dimensions will create an interior opening that will be a sliding fit with the Fiji bottle only if the wood is one inch thick. Wood of a different thickness can be used, but the width of the pieces would need to be adjusted to ensure that the interior square hole is 2 and 3/8 inches square, if the spiral assembly configuration is used. Drill a hole 1/2-inch diameter into the side of each wood piece, with the hole angled upward at about 45 degrees. Begin at about the halfway point, measured from top-to-bottom. Each hole should be placed so that it will end up in about the middle of the interior square, as measured from side-to-side. For my box, this means that the hole would be drilled about 2 inches from the bottom and 2 and 3/16-inches from the left edge of the wood piece that is facing the viewer in the photo. Mark the rim of the box that has the interior ends of the holes closest to it as the "top." You want the bees to travel upward as they crawl inward.

Step 3: Fit Plastic Bottle and Mark it For Holes

Picture of Fit Plastic Bottle and Mark it For Holes

Cut the bottom off the Fiji bottle, and trim its length so it almost fills the box's interior hole. Put a match mark on one side of the bottle and on the same side of the box. Trace the holes on the inside of the bottle, then slide out the bottle and cut out the holes in the plastic. A pair of curved fingernail scissors works great.

Step 4: Prepare Lid for Box and Box for Lid

Picture of Prepare Lid for Box and Box for Lid

Mate the lid to the "top" rim of the wood box, match mark them both, mark and drill holes in the lid for screws, countersink the lid for screw heads. Drill pilot holes in the box for the screws, but do not attach the lid to the box yet.

Step 5: Attach Bottle in Box

Picture of Attach Bottle in Box

Match up the match marks and slide the Fiji bottle into the wood box, with its threaded neck hanging out from the "bottom" rim of the wood box. Ensure that the holes in the plastic line up with the holes in the wood then attach the bottle into the box. I used an ordinary office stapler to place four staples, then tapped them flush with a small hammer.

Attach the lid to the "top" rim of the box using four screws. Do not use glue, in case the lid needs to be removed in future in order to replace the Fiji bottle.

Step 6: Connect Two Bottle Caps Together

Picture of Connect Two Bottle Caps Together

The best way to connect the two bottle caps together is to use a metal grommet, as shown in http://www.instructables.com/id/Attach-Plastic-Bottle-Caps-for-Carpenter-Bee-Traps/. If you want to try some kind of outdoor tape instead, cut out the flat part of two caps and hold them together while winding the tape around the caps. Use tape wide enough that its edges extend past the caps and can be folded over into the inside of each cap. That way, threading the caps onto the bottles will also help keep the tape from peeling off.

Step 7: Mount the Trap, Attach the Capture Bottle

Picture of Mount the Trap, Attach the Capture Bottle

Drill a small drain hole through the lowest point of each small cup-shaped depression in the bottom of the Deer Park bottle. As shown in the Intro photo, I used two metal angle brackets and screws to fasten each of eight traps to the underside of the overhang of my mansard style roof, where I usually see the bees looking for places to bore. The trap can also be hung up by a wire or cord so long as it is placed where wind cannot cause the trap to swing and hit something.

I leave the traps in place year round and screw on the capture bottles just during bee season. It may be that bees caught in the capture bottles help attract other bees, so I am in no hurry to empty them. It may even be worthwhile to place some captured bees, dead or alive, into the bottles of empty traps, in order to enhance the attraction of the latter. This exercise is left to the reader. I do make sure that all the bees in a capture bottle are dead before I unscrew it from its trap in order to discard the bees.

Never use insecticide on any part of a trap, or near a trap, as doing so may repel the bees.

Unclesam

There is a much easier and more ingenious design for a trap that uses a simple block of wood and can be seen at my frugal home . com . I'm going to the lumberyard today and have them cut me some wood.

That is easier and quicker. I like the trap here, but I need a half dozen _now_ and that block of wood/mason jar trap is perfect.

Scott_Tx1 year ago

going to try and make one of these but going to put a board in the bottom with a hole just big enough to screw in a pop bottle.

aebe2 years ago
If you really have to get rid of those bees , just take away their nesting habitat . they prefer wood that has begun to rot , makes for easier excavating . Carpenter and other solitary bees are just as useful in pollinating as are honeybees . Honeybee are being killed in huge numbers , by disease and pesticides . And as you will have trouble finding anyone who has been stung by a bumblebee , why kill the little critters ?
dracnam aebe2 years ago
Because they are destroying my new decks that I have just built costing thousands of dollars.
I hope you are successful in killing them all dracnam! I also have them. People who haven't had the experience, have no idea of the destructive power of these "little critters"! It's like saying "Let's live with termites ... they won't eat much!" I'm going to try this! Did you try it and did you have any success?
aebe dracnam2 years ago
That sounds like a genuine infestation . Do you have any piles of rotting wood , abandoned buildings ,any kind of wood laying unused on your property or neighboring land ? If you do ,you could keep emptying bee traps and there would be a fresh supply , forever . Your county insect or animal control office might be able to help , or the county's extension service could . That last is an office operated by your state's university agriculture program .
how about because they are loud, invasive and while adults understand the workings of bees small children still have the shriek and scream reaction! and those of us with deadly allergies to bees do have other things to think about than some annoying bugs. I dont care how endangered they are they aren't worth a human life.
fenikkusu1 year ago
This is awesome and when spring comes I'm going to give it a try. For the deluge of nay-sayers below... Carpenter Bees are enormously destructive, eating HUGE holes into the wood of your house. They are NOT bumblebees! One of the sexes stings. Seriously they will make Swiss cheese out of your home! If you haven't had the experience, please withhold the negative comments. It's like saying let's live with termites...they won't eat much! They are most certainly a pest that should not be tolerated for the good of your home and the neighbor's homes that they will infest at a later date! ~ written by someone who has them!
dracnam2 years ago
There is no wood or any kind of refuse just clean yards all around us but still we have these destructive carpenter bees.
Kiteman2 years ago
Why not just give the bees somewhere else to live? Put up a tempting nest box instead.

Remember: one third of US food production, 130 crops, depend on bees that are already globally endangered.
ringai2 years ago
Very ingenious trap! Much better than spraying some insecticides on the house. Reusing those plastic bottle was a good touch, too. I like the top-to-top caps, too, good thinking.