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    Japanese Beetles

    Anyone else seeing these little critters skeletonizing leaves off their trees? Not only that but they leave a little pile of crap. These beetles are green with bronze colored wings. Any entomologists suggestions on what to do? Thanks!!



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    Re: Japanese Beetles

    Problem with these guys is that you can kill them on your own plants, but there's so many of them out there that a day or two later they will just flock back from a neighboring field/yard.


    Last edited by Agclone91; 07-18-2011 at 06:50 PM.

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    Re: Japanese Beetles

    Quote Originally Posted by cycloner29 View Post
    Anyone else seeing these little critters skeletonizing leaves off their trees? Not only that but they leave a little pile of crap. These beetles are green with bronze colored wings. Any entomologists suggestions on what to do? Thanks!!
    Yeah, they love my cherry tree. Sprayed them ortho, but they were back the next day.



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    Re: Japanese Beetles

    Quote Originally Posted by cycloner29 View Post
    Anyone else seeing these little critters skeletonizing leaves off their trees? Not only that but they leave a little pile of crap. These beetles are green with bronze colored wings. Any entomologists suggestions on what to do? Thanks!!
    Buy the traps. They work very well.

    Shop japanese beetle traps at Lowes.com



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    Re: Japanese Beetles

    Quote Originally Posted by NebrClone View Post
    Buy the traps. They work very well.

    Shop japanese beetle traps at Lowes.com
    I spoke to the ISU extension entomologist today as I have discovered jap beetles all over. He recommended that you DO NOT put traps up as they attract beetles from all over and you will be overwhelmed with them. He recommended Sevin sprayed often or you can hand pick 'em and throw them in a bucket of soapy water.


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    Re: Japanese Beetles

    DO NOT BUY THE TRAPS.

    Spray Permethrin on affected plants/trees once per week. It will take a couple treatments, but they will stay away if you keep it up. Also remove what you can with your hands a couple times a day until the insectiside takes effect.

    Others will say to use Sevin, but that crap is pretty toxic.



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    Re: Japanese Beetles

    The Bayer stuff seems to kill them and keep them away better than the other stuff I've tried. Looks like it's the same thing as Sevin. I have five trees/plants they love to eat, and they are a huge problem if I don't take care of them.

    EDIT: I've actually been using Bayer Rose & Flower Insect Killer, which does not contain the same ingredient as Sevin. It is not supposed to be used on edible plants, however. I'll probably give permethrin a try since it can be used on edible vegetation.


    Last edited by mred; 07-18-2011 at 09:15 PM.

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    Re: Japanese Beetles

    Entomologist here.

    Right on bro - TRAPS ARE BAD. Neighbor wars have actually broke out over the use of the traps. One neighbor loves looking at all the dead beetles in the traps while the surrounding neighbors end up with more beetles than before because the traps lure in more than they catch.

    This short, but to the point, article from ISU is from 2008, but the control recommendations are still current - Japanese Beetle | Iowa Insect Information Notes. I know crops are being sprayed for them right now, especially high-value seed production.

    Here's the current map of where JB is known to be in Iowa (53 counties), a compilation of data from ISU and the Iowa Department of Agriculture & Land Stewardship - Japanese beetle distribution, 2010 | Horticulture and Home Pest News. We keep track of this because if nursery stock is raised in an infested county, the produce has to go through extra steps before it can be exported to states to the west.

    The USDA actually regulates airports for JB, as they manage to clumsily fly into planes (especially cargo) and quickly move across the county. So, BMPs are used to reduce the number of incidental flyers.

    Each year the number of calls on JB is increasing. People are always asking what they can plant that the JB won't eat ... ahhh, good luck with that. Generally speaking, it I want to see if they're in an area, I find a linden tree or roses and check them first. Kentucky has a good table of preferred host plants at Japanese Beetles in the Urban Landscape | University of Kentucky Entomology.

    And I can't help but add that this guy landed in the US in 1916, from our friends in Japan. And just like our other green friend, the emerald ash borer, it wasn't really a problem in its native land, but is a big problem here.

    Just once, I wish we could accidently import something that eats mulberry ... no luck.


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    Re: Japanese Beetles

    Dad works at ISU extension, took his advice regardin Sevin the dust or spray. Lowes 6 bucks and boy did it work...no more on my trees...felt bad for the neighboring clone fan and did his trees as well.


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    Re: Japanese Beetles

    I'd need a crop duster to spray my 60' trees. Just checked our trampoline and it is covered crap after i cleaned it off last night.I suppose all I can do is watch them eat leaves.



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    Re: Japanese Beetles

    Quote Originally Posted by cycloner29 View Post
    I'd need a crop duster to spray my 60' trees. Just checked our trampoline and it is covered crap after i cleaned it off last night.I suppose all I can do is watch them eat leaves.
    They aren't gonna kill a tree that is 60' so don't worry about that! It can be rather unsightly, but rarely does it kill the plant.



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    Re: Japanese Beetles

    Quote Originally Posted by cycloner29 View Post
    Anyone else seeing these little critters skeletonizing leaves off their trees? Not only that but they leave a little pile of crap. These beetles are green with bronze colored wings. Any entomologists suggestions on what to do? Thanks!!

    yes they went to town on about 15 of my rose bushes in the matter of 3 days... i had to spray them 3 times to get rid of them, but it worked... store bought spray worked just fine and the plants seem to be okay.



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    Re: Japanese Beetles






    Honestly though, I have also had no luck with those traps out at a cabin I have. Set some of those traps, came back about 3 weeks later to check on everything. It looked like they had multiplied like crazy. They were much worse than before. Luickly, they haven't been much of a problem so far this summer.


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