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Discussion in 'Fertilizer Application' started by Chuckduck, Jun 22, 2019.

  1. Chuckduck

    Chuckduck LawnSite Senior Member
    Messages: 635

    When is the best time to put down some MERIT for a preventative grub control in Illinois ? Or is there something better you recommend ?

    Thanks in advance !
  2. RigglePLC

    RigglePLC LawnSite Fanatic
    Messages: 16,871

    Merit is good.
    Acelepryn is also good. Safer and perhaps kills a few mature grubs--in addition to new young grubs.

    The best time is about the date the new eggs hatch--the tiny new grubs are easy to kill. This means you want to have the product down about the week the eggs are laid--or just before. About the week you see lots of Japanese beetles. Or European chafer (but they fly at night--not often seen). They fly--mate--lay eggs--and then you treat.
    Consult the websites of nearly university for turf or garden information. They will be aware of likely egg-laying season. Four rough measure, about the first week of July.

    Last edited: Jun 22, 2019
  3. Smokindog

    Smokindog LawnSite Senior Member
    Messages: 375

  4. RigglePLC

    RigglePLC LawnSite Fanatic
    Messages: 16,871

    Bifen gets tied up in the top 1/4 inch of soil. It will seldom kill a grub. I think the label's 3 month residual is an exaggeration. You want imidicloprid (Merit.)
  5. Smokindog

    Smokindog LawnSite Senior Member
    Messages: 375

    Thanks! My thoughts were maybe I'd kill the sources of the grubs with the Bifen before the grubs occurred :)

    I'll look into merit. I was also looking for a legitimate use of the Bifen. I bought this bottle as it was less expensive to treat more than an acre of Bermuda. We had the army worms BAD down here last Fall :) I need to look at the shelf life.

    I may just stay with the granular grub control I have in the garage from from the Big Box. It's only a 1-2K area that seems to be the repeat problem. It's the shadier part of the yard and it's also the runoff area so it stays wetter than the rest of the yard.

    BTW - This article says the same thing :) And the Grub-Ex I have is apparently the same active ingredient as Merit!

    Last edited: Jun 23, 2019
  6. andersman02

    andersman02 LawnSite Senior Member
    Messages: 827

    We use acelepryn for preventative, just finishing up those in the next week or so, then we use arena, then dylox late season. Acelepryn works really well
    hort101 and Smokindog like this.
  7. RigglePLC

    RigglePLC LawnSite Fanatic
    Messages: 16,871

    The TAMU informational sheet is old news--Scotts dropped Merit and substituted acelypryn for the Grub-Ex active ingredient a few years ago. Probably a better active ingredient and safer. Not likely to kill non-target bees and butterflies.
    Unfortunately--they did not change the name of the product--I guess this is still legal.
    Dog1234 and Smokindog like this.
  8. lawn king

    lawn king LawnSite Silver Member
    Messages: 2,662

    Acelypryn does not seem to work on grubs in new England as well as it does in the Midwest and south?
  9. Yatt

    Yatt LawnSite Senior Member
    Messages: 317

  10. jonthepain

    jonthepain LawnSite Bronze Member
    Male, from Raleigh
    Messages: 1,219

    This exactly what NC State recommends.

    The reasoning is that the residual of your treatment will be long enough to get the grubs while they are hatching, if you apply as soon as you see Japanese beetles flying around, because that is when they are laying their eggs.

    Typically June around here.



    hort101 likes this.

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