Japanese Beetles stopped by Weedblock (followup) *It worked!*

tristateJune 24, 2010

I posted a message on Peonies forum asking if anyone knew if Weeblock was effective against Japanese Beetles. I had covered a row of peonies w/it in anticipation of building a wall next season. (The row was 12 feet long x 4 feet wide with just a slit for each of the 7 bushes). I noticed no Japanese Beetles when I usually thought they'd be out- 1st&2nd weeks of June. I thought that was weird- people said just wait until flowers are gone and then they'd be out. Someone else said it might take longer for them to emerge b/c once they hatched, they'd have to crawl at least 1 1/2 feet to get from under the weedblock. (If they chose the wrong direction though, they'd have 2+feet before they ran into another plant).

Flowers have been completely gone for over a week now and STILL not even a sign of ONE. I didn't use any insecticide or milky spore and hung 2 pherome lures which caught some which I think may have been flying past.

Does anyone know if grubs were effected by last year's rain/cold (I'm in the Hudson Valley NY) so what I'm attributing to weedblock is actually a naturally phenomenon? Is it possible that I've killed off an entire season of beetles and stoppped the next generation of eggs being laid?!!

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I think you were just lucky. I did not post on your earlier question because it would have sounded bad no matter how I worded it.

Although you may have blocked a few bugs the largest percentage would have come from the surrounding non blocked area. How many of the white grubs do you normally dig out from this area. July and August is the time to apply insecticide while the beetles are in the white grub stage.We do not have a major problem with Japanese beetles but I would like to know if they normally eat peonies in your area?

Just a tibbit. If you would happen to pick up a garden book from the early 50's the Japanese beetle that was shown is not the current bug. At that time the green scarab beetle was what was shown as Japanese beetles not the brown things of today.

    Bookmark   June 24, 2010 at 3:06PM
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We've had a bad drought several years in a row that appears to have killed off the previous years' plagues of japanese beetles. I agree with the above poster- no way weed block would kill all the beetles!

    Bookmark   July 5, 2010 at 10:21AM
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