Old 07-21-2013, 09:02 AM
tjhowe2005 tjhowe2005 is offline
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Location: Lake Geneva, WI
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Japanese Beetle in Southern Wisconsin...HELP!!!

Please Help!!! I just took over maintaining the landscape on 15 huge properties. They are very nice homes on a lake here. I am getting everything up to snuff but we have a new problem here with Japanese Beetles. I know it has been a long term problem out east so I need your suggestions. I have an infestation mainly on my canna lilies, roses, creeping hydrangeas and oak leaf hydrangeas. To my knowledge it is too late to do a soil drench so I should do a foliar application of imidacloprid with a pyrethroid like permethrin. I have Merit 2F (21% imidacloprid) and permethrin (10%). No one in my area has a clue (even the chemical dealers) on proper mixing rates or application techniques, they just tell me to read the label which is little help. I want to do this properly and don't want to indiscriminately run around spraying pesticides that do have negatives. I am aware of the questioning of colony collapse disorder with imidacloprid. Some of these homes have hundreds of each of these plants, so whatever I do there will be a lot of pesticides used, and there is a lake there we don't want to effect. Do any of you have suggestions for me????
Thank You
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Old 07-21-2013, 10:04 AM
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RigglePLC RigglePLC is online now
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I don't think you need the imidicloprid. Cyfluthrin is fine. And only spray the plants that are being attacked. And...check out the biological control Ovavescicula...for eventual long term control. See this link from Michigan.
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Old 07-21-2013, 10:13 AM
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foreplease foreplease is offline
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Agree with Riggle on imidacloprid. I have had great results and fast with Spectracide Triazicide on landscape plants. Company's link to the label is not currently working but this one will give you some information. Be sure to get the concentrate rather than RTU.
Michigan PABL
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Old 07-21-2013, 01:22 PM
tjhowe2005 tjhowe2005 is offline
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Thanks Guys!!! Last week I did do a foliar application of Lambda-cyhalothrin combined with Merit and will see how it looks this week. If I use Cyfluthrin or other similar pyrethroids for control, how many days should elapse between applications? These plants are all on irrigation that is currently running 3-4 times a week. Also, should I rotate the pesticide I use so I don't breed resistant beetles? The Ovavescicula looks like a great longer term option and I will investigate using it.

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Old 07-21-2013, 04:14 PM
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phasthound phasthound is online now
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You might want to check out ICT Organics Essential 1. It is an all natural, EPA Exempt Insecticide/Miticide that is very effective.
Barry Draycott

The nation that destroys its soil destroys itself.
Franklin D. Roosevelt
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Old 08-03-2013, 05:14 PM
tjhowe2005 tjhowe2005 is offline
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Used Cyfluthrin on the plants affected and it worked well...thanks!!!
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Old 08-03-2013, 05:23 PM
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DA Quality Lawn & YS DA Quality Lawn & YS is offline
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Yeah I have seen a few straggler Jap beetles around here too. Hate to say it but we need a good hard cold winter to send em back down south again.
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japanese beetle

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