Do Japanese Beetle Traps Really Work?

Packages of Japanese Beetle traps
Japanese beetle traps can attract more beetles than they catch.

When your garden is being skeletonized by Japanese beetles, those pheromone traps sure do look tempting! And if you hang one in your yard, you’ll certainly be rewarded with a full bag of squirming beetles on a regular basis. But do they actually reduce the number of beetles in your yard, or attract more to it?

Japanese beetles arrived in the U.S. in the early 1900s, and have spread across much of the eastern part of the country. They attack the leaves of a wide range of plants including trees, flowers, fruits, and vegetables.

How Japanese Beetle Traps Work

Japanese beetle traps release both a sex pheromone and a floral scent, are very effective in attracting adult beetles. They fly to the trap in droves, where they crawl or fall into the bag and can’t get out. You simply dispose of the bag, and put on a fresh one, and the process starts all over again.

The problem is, the traps attract about four times as many beetles as would normally be in your yard, and only 50% to 75% of them will actually end up in the bag. The rest bounce off and make their merry way into your garden, where they vigorously set about munching your plants and laying plenty of eggs for next year’s beetles.

So, yes, technically speaking, the traps work like a charm in attracting beetles. But in terms of actually reducing the beetle population around your plants, they may be helping your neighbors more than you.

Japanese Beetle trap hanging from house
The lure on the trap attracts Japanese beetles into the bag.

Like other pheromone insect traps, Japanese beetle traps work best as a survey tool. By putting one out in early summer, you can get an idea of how bad the infestation is, which can help you make better decisions about how aggressive you need to be in your control program.

They also work great if you have a very small, isolated population of beetles that can easily be lured and controlled by the trap. In most cases, though, if the beetles are in your yard, you can bet that they’re all over the region.

Tips for Using Japanese Beetle Traps

If you’d like to try using Japanese beetle traps, follow these tips:

  • Keep a Distance: Place the traps as far away as possible from the plants you’re trying to protect.
  • Pheromone and floral lure in Japanese Beetle trap
    Lure in Japanese beetle trap.
  • Install Downwind: Make sure to hang the traps downwind from your garden, so that as the beetles follow the wafting scent from the trap, they won’t be flying right over your garden and be tempted to stop for a munch.
  • Get Neighbors Involved: Since beetles can travel for up to a couple of miles, a community-wide control program, with traps placed strategically throughout the area, works better than a few isolated traps in yards.
  • Keep Traps Fresh: Not only can the lures go stale, but the bag full of dead bugs can cause the trap to stop working. Replace the lure according to package instructions, and replace the trap bag every few days.
  • Time It Right: Adult beetles are most active during June, July, and August. Traps are only effective when the adults are out, particularly during the early season before they’ve done too much mating and egg-laying.

Further Information


  1. Dear partner!

    I am head of horticulture in Ba bur’s garden in Kabul Afghanistan and I read your useful article carefully, so I have a question: Our garden total area is around 11.6 hectare which 6 hectare of it is turf grass that affected by June beetles final stage larva’s , now I am decided to put light traps as soon as we seen the first singe of beetles flying so how far a part and how many traps I should displace?

  2. Myself and everyone I have talked to about using these traps say the same thing. Our plants are no longer being decimated by this intrusive species. I see a few here and there on their favorite munchies, but nothing like I had seen in years past. Can’t spray for them on flowering plants because it will kill bees and other legitamate pollinators. My trick is to empty the bags into a grocery bag every day while they are still alive and kicking. This way you can re-use the funneled bag it comes with. If you let them die and rot in the bags, you will be smelling the equivelant of the corpse flower. I use( 2 ) traps spaced about 40 yds. apart from each other. If I attract more from afar, so be it. The only good jap beetle is a dead jap beetle! Maybe make a dent in the population next year? Hope so!

  3. I’ve been dealing with this in my new home for the last 2 years. I was going out every night and letting them dipsy dive into a bucket of soapy water and letting them drown until I found this trap. I would catch up to 15 a day. My husband put this trap up yesterday, we collected around 70 in just the one day. I told my husband, that my neighbor who is always out picking them off her plants that she’s gonna wonder what happened to all her japanese beetles. LOL. They’re all in my yard. Is there anything I can spray on my raspberry bush and roses that are natural and will keep the beetles off of them while this bag gets the rest.? Thanks for the article.

  4. Bag s Bug s not a good idea from my experience. They have been attracting beetle from miles around. I have, literally, just disposed of at least 25,000 beetles over the past 24 hours.

  5. Yes the traps get Japanese Beatles . In 3 days I have 100s of them in my two bags. I just noticed my apple tree is getting murdered, so I put the bags near the apple tree. It drew a zillion out of the tree.

    Not sure if the bags are attracting the JB from other yards.

    The bags are not the entire solution, but it fun to kill some off. Need better prevention.


  6. It sounds like you are discouraging the use of these but I had a 40’ river birch that was being decimated. Pesticides are not an option as I have Honey bees. I put out 8 traps about a hundred feet from the tree. I live on 5 acres so I am my own neighbor. In 10 days i have filled to the top 20 bags. Descriptions state about 4,000 beetles per bag. My tree does not have one bug in it and seems to be recovering. My opinion is even if i am attracting bugs at least they are being bagged. I will plan on putting traps out next year in June and try to get ahead of them.

  7. I planted a young beech tree in my yard last year, and noticed Japanese Beetles on them then, but not very many, and so I hand picked them for the season. This year, a new and more massive infestation appeared on our virginia creepers as well as thee beech tree. I was killing about 40 per day on my own, but decided to try the trap after talking to a neighbour. In a a few days, the bag is full, and my tree has not a single beetle in it. We removed the vines as there was almost nothing left of them. I am happy with the result and would recommend trying the bag. However, it is alaarming to see how many are initially attracted to the bag. Just keep it out and wait – you will see results.

  8. I have one of the best plants to attract JB, a 40 foot length of grape vine. I was seeing 10 to 12 beetles per leaf when I finally put out the traps. Instead of away from my vines, I put them right next to the vines. Each morning I would shake the beetles into a large jar of soapy water. After each “harvesting” session, I would shake the vine to disrupt their fun and games in the leaves and get them to fly therefore many would settle on the traps. Yes, I was pulling JBs from my neighbors, but I was killing as many as possible, meaning they would have fewer adults in their yard to lay eggs for next years crop. I also am going with the Milky Spore treatment in mine and my closest neighbors yards to reduce the larvae for next year. An added tip I heard was to put a bucket of soapy water under the trap. As the JBs bounced off the trap, they would fall into the water and “die you little SOB”!!!!!

  9. I wrote a nice informative comment earlier this morning and have not seen it appear. I even removed the swear words I usually use as I speak of Japanese Beetles. Where did it go?

    • Hi, Dale! All comments are moderated so it takes time for us to approve them. In fact, that comment has since published. Take care! 🙂

  10. I am so infested with beetles each and every year. For the first few years I used traps. The first year I half filled 11 50 gal. trash bags in one week. The bags that come with the traps filled within one hour. I purchased the property from a couple who maintained low standards. Today 11 years later there is little decrease on beetle population. Each morning and evening, while the beetles are slow and sluggish, I suck them up with a leaf vac. They crunch as the go through the grinder. If anyone has found a spray that is organic that beetles find distasteful please let us know.

  11. These traps ABSOLUTELY work! Put them out early, and use more than one. These work like vaccinations and herd immunity, you need several through a neighborhood, to get the populations down, and getting them out early before they can lay eggs is key. If your bag fills too fast, simply leave the bottom of the bag open, and duct tape a kitchen garbage bag around the opening of the trap’s bag. Then hang it low enough so the bottom of the bag rests on the ground. You can let that sucker FILL.

  12. I love the traps. work great. catching these beetles after last years bad episode is working Great. last year they devoured my plants especially my basil. omg it was a bad year. never had them before. bought these traps this year and when i saw the first one i set them up. None on my plants and all in the bags. love it. When i bought mine i wasn’t sure it would work but after seeing this i am . told all my friends about these traps and to buy them as they DO Work.

    • Thanks for sharing your experience with the Today’s Homeowner community!
      TH community members helping other TH community members — we love it. 🙂


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