Battling Beetles in Woodbury

Have you run into those pesky Japanese beetles in your yard?

The leaves on your trees not looking as lush as they should?

Japanese beetles have been spotted in the Twin Cities, including Woodbury.

"They will feed on the leaves... they feed between the veins, a kind of feeding called 'skeletonizing.' They also feed on flower blossoms," University of Minnesota Entomologist Jeffrey Hahn told KARE 11. "They start coming out, basically, the first week of July. So, think of the Fourth of July when Japanese beetles will come out and then they are active for the rest of the summer. I mean, we will see them into September."

Last summer, Woodbury resident Lisa Thor, who lives in the city’s Highland Heights neighborhood, said she .

“I think I was finally able to get my annuals out about mid-June, and the beetles flocked to them immediately,” Thor said then. “I just noticed the beetles on my birch tree about three weeks ago.”

Hahn that the beetles since 2001 have been concentrated in Hennepin and Washington counties.

“The Japanese beetles like to feed on over 300 types of vegetation, so it’s really hard to say why these beetles favor these counties,” said Hahn. “Beetles do attract other beetles, so once they find food sources, you can bet on others showing up.”

In a blog post, Hahn gives some tips for treating beetles:

The beetles are pests “because the adults feed on the leaves and flowers of many plants while the grubs feed on the roots of turf grass,” he wrote “If you have seen JB grub damage in the past, July is a good time to treat your yard. Use a preventative insecticide, like imidacloprid, after you see adults flying, about late June or early July this year. By the time eggs are laid and grubs hatch, about two to three weeks, the insecticide will be taken up by the grass and the young grubs will be exposed to it.”

If you’re looking to get rid of them, one thing seems clear—do not use traps.

“Research does not support these types of traps and it actually attracts more beetles to an area, so you are doing more harm than good,” Hahn said. “As far as trees go, assess where the trees are in your landscaping and if the trees are an important focal point of your yard, I’d get them sprayed."

For more information check out a University of Minnesota Extension page about Japanese beetles.


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odessa June 27, 2012 at 03:50 AM
They have been feeding on my flowers in Woodbury for a week or so!
Kim Lemrick June 27, 2012 at 12:45 PM
Found one on my flowers yesterday :(
Kris Janisch June 27, 2012 at 01:29 PM
Boo. Have you tried anything to get rid of them Odessa and Kim?
SomeGuy June 27, 2012 at 03:08 PM
Not yet this year. But after they devoured all of the leaves off a young maple (about 15 feet tall) last year in fewer than three days, I am armed for this year.
Kris Janisch June 27, 2012 at 03:17 PM
What are you using to combat the beetles Guy?


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