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August 11, 2016

For years I’ve read horror story about Japanese beetles invading gardens. I’d even talked to local gardeners who have been plagued by the irridescent buggers. But until this year I’d never even laid eyes on one.

I read an article that suggested that our springs are too cold here (and particularly at my house near Lake Michigan) for them to get comfortable and take up residence and that seems like a logical explanation. Given the warm spring and very mild winter we had and the fact that I’m seeing them now for the first time also supports this theory.

This little bugger was just one of the little guys hiding in the blooms of my containerized rose. On the right you can see some of the damage they caused in the flower.

I first noticed them a couple weeks ago when I returned from being gone for 10 days. I was admiring the new blooms in my potted rose (developing because I was diligent about deadheading before I left), and noticed something black in the middle. When I pulled it out, there was no doubt: This was the dreaded Japanese beetle I’d heard so much about. I promptly crushed it and then found two more in other flowers that met similar fates.

I’ve only found them in flowers so far but I’ll bet my total number of kills is up to 15 or so. And I’m not naive enough to think I’ve found all there are to find.

So far I’ve only found them in that particular rose, but I’m keeping an eye out for them elsewhere. They made a real mess of the flowers, chewing big holes in them, and I’m certain they are doing other damage that I’ve yet to discover. I’ve not noticed any leaf damage yet.

I’m concerned because some of their other favorite plants to munch on are viburnums, which I have at least a dozen of, zinnias and apples. I’ve checked the apple tree but I need to give the rest of the plants a close inspection.

I’ve also started doing some research on them, and it’s not hard to find. Here’s one good paper with some information from which I’ve just learned that squishing them is a bad idea because they release a pheromone that attracts others of their ilk. Turns out I should be drowning the little buggers in soapy water.

I’m not sure if Japanese beetles will be an ongoing problem after this year at my house. If we get a typical Wisconsin winter and spring, that may solve the problem (and cause others including making the gardener crabby), at least temporarily. Still, I’d have been plenty happy to remain one of the few who was blissfully unaware of this invader.

bugs japanese beetle roses
by Erin @ The Impatient Gardener 
14 Comments

About Erin @ The Impatient Gardener

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Comments

  1. Kathleen says: August 11, 2016 at 11:10 pm

    Hi Erin,
    Here is a link to Hartwood Roses. Connie gets tons of Japanese Beetles and has developed a trap for them. http://hartwoodroses.blogspot.ca/2016/07/whos-tearing-up-beetle-trap-bags.html

    Hope this is helpful.

    Reply
    • Erin Schanen says: August 12, 2016 at 7:10 pm

      Thank you Kathleen! I'll check it out.

      Reply
  2. Tracy says: August 12, 2016 at 2:04 am

    We got attacked big time! My bushes, my small rose bush, hostas! They aren't picky at all. My mom's front yard looks like fall, they got her birch tree.

    Reply
    • Erin Schanen says: August 12, 2016 at 7:10 pm

      Hostas too? Oh man, I do not want these things!

      Reply
  3. Roxie says: August 12, 2016 at 12:18 pm

    They're in CO big time. I go out every morning with my bowl of soapy water and plastic fork (I don't like using my fingers because they grab on, eeewwww) and hunt for them. They've mostly been attracted to my pole beans this year and a few here and there on my zinnias and other plants. A lot of people here treat their lawns with milky spore to kill the larvae.

    Reply
    • Erin Schanen says: August 12, 2016 at 7:11 pm

      What a pain. I hope I don't need to resort to anything other than my jar of soapy water, but it's good to know how other people are dealing with it.

      Reply
  4. Lisa Greenbow says: August 12, 2016 at 3:01 pm

    They are nasty little buggers and do a lot of damage. They LOVE roses or most any other flower I have found. Good luck with eradication.

    Reply
    • Erin Schanen says: August 12, 2016 at 7:12 pm

      I'm almost afraid to go looking for them elsewhere because of what I might find.

      Reply
  5. Ms. Wis./Each Little World says: August 12, 2016 at 4:54 pm

    Have had them once or twice but not serious infestations. We seem to have other pest problems with a couple of groups of trees and this year serious anthills that I have not been able to get rid of.

    Reply
    • Erin Schanen says: August 12, 2016 at 7:11 pm

      The ants have been crazy this year here too.

      Reply
  6. Elizabeth says: August 12, 2016 at 6:16 pm

    Ugh, I hate them so much. Thankfully we don't have many here, though this year we have more than usual (I think because of the mild winter we had). I hope this isn't the start of a yearly Japanese beetle visit for you!

    Reply
    • Erin Schanen says: August 12, 2016 at 7:11 pm

      Oh man, me too!

      Reply
  7. Susan J. Walton says: August 12, 2016 at 8:26 pm

    My husband uses his BernzOmatic torch to kill them. We have also used Bacillus thuringiensis (Bt) galleriae (a quick search will yield several products that contain it) and noticed far fewer beetles the following year.

    Reply
  8. Kathy Willmering says: August 12, 2016 at 11:48 pm

    I live in Wauwatosa, and have been seeing the nasty buggers for about 7 years. For a while, they were just eating the tree leaves (Linden and Newport Plum). This year, they started in on my roses. I have decided to follow the two-pronged approach of picking off adults and following up with grubicide. But, my yard is not large, and I can easily get around to all my bushes on a regular basis with a deli container of soapy water (you only need a couple of drops of dish soap). I have plastic gloves on, and grab the bugs with my fingers and throw them into the water. They attempt to swim for a little while and then give up and drown. I pour the “beetle juice” out on the driveway after a few hours. Sometimes birds go after the dead bugs. I have not noticed the carcasses attracting live Japanese Beetles the way those trap bags do. A few weeks ago, I was getting 40 or so a day. Now, it is down to 6-8. Especially in the beginning, I was trimming my roses, particularly the places where I noticed the bugs. I read that they leave a scent or residue. So, for a little while, I’d get a rose bloom and then chop it off almost the same day. Very disappointing. Good luck to you!

    Reply

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The Impatient Gardener

Do you love gardening? Me too! I'm Erin and I garden in Southeastern Wisconsin, zone 5. The Impatient Gardener is all about real-life gardening: the good parts, the bad bits and even the funny stuff. It's part information, part inspiration and a little bit commiseration. Thanks for visiting.

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These sister dahlias are big, beautiful girls. Pen These sister dahlias are big, beautiful girls. Penhill Watermelon (first picture) and Penhill Dark Monarch are the best two HUGE dahlias that I grow. They share slightly twisty petals (Watermelon more so) and, when you look closely, subtle striations that add a beautiful depth of color. Watermelon grows taller than Dark Monarch (7 feet tall or more sometimes) and they both need serious staking, but it’s worth it because they produce a lot of flowers for a large-flowering dahlia. 

I like them both but if I was forced to choose (and who would make me do that?) I’d give the edge to Dark Monarch because it’s a little easier to manage size-wise, produces more flowers and has a bigger variation in flower color so it’s always interesting. 

Which do you like better?
I don’t love tools that only do one thing. But w I don’t love tools that only do one thing. But when there’s only one tool that does that one thing really well, I’m here for it. This pottery/container knife from Sneeboer makes it possible to actually get plants out of pots without breaking or damaging the pot. It’s also really expensive. 😀
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All of these self-sown Nicotiana are probably at least partly the children of the F1 hybrid Perfume series, which grow to be about 24” tall or so. Last year I grew purple, pink, white and lime versions and these are likely new variations on those. 

Picture 3 is, in my opinion, a good example of how these self sown second-year hybrids can go wrong. I’ll probably rip that one out. 😀

And the last photo is of my favorite colorway, lime, popping up amongst the Zinnias. I find these self-sown Nicotiana popping up all summer, so there’s always a fresh-blooming supply. 

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