Wondering if it is too late to apply Imidacloprid based grub control on Long Island?

Discussion in 'Pesticide & Herbicide Application' started by mictrik, Aug 6, 2009.

  1. mictrik

    mictrik LawnSite Member
    Posts: 245

    Normally when i apply this it is around the second week of July but i missed it this year. I was going to apply it this week, perhaps today; is it too late? I will be using Grubex with Imidacloprid, the same active ingredient as Merit. Any advice will be appreciated...
     
  2. turf hokie

    turf hokie LawnSite Silver Member
    Posts: 2,744

    Too late, wait a couple of weeks and use a post control such as Dylox.
     
  3. Whitey4

    Whitey4 LawnSite Silver Member
    Posts: 2,448

    The beetles flew here about a month ago. I imagine they laid eggs, two weeks later, the grubs should be in the first instar having just hatched... but hokie, you think this is the wrong time to apply?

    I was under the impression this is the best time to apply.... a window that started 3 weeks ago and is still open.
     
  4. turf hokie

    turf hokie LawnSite Silver Member
    Posts: 2,744

    Whitey, you would know better in your area but I just feel that by the time the merit gets into the plants and becomes effective you will have had grub damage already.

    I just had to pull the tomatoes out of my garden, friggin late blight....but I had some fully developed grubs in the garden. So I am assuming that with the wet weather we have had in July the grubs have had perfect growing weather, and are ahead of what normal assumptions would be.
     
  5. Whitey4

    Whitey4 LawnSite Silver Member
    Posts: 2,448

    Me knowing better than you? I seriously doubt that.

    But they did hatch here about 4 weeks ago. Didn't see many adults, and at that only saw them for one week, but did have about 15% of my lawns damaged last year. I applied early last week to those lawns and my own. Merit is restricted here anyways.... and I'm not certified to apply it this year. I used Dylox.

    I haven't dug up any lawns yet, but I suppose I ought to, just to see where the larvae is in terms of development.

    Fully develped grubs? like in the fifth instar? That would be a very late hatching... maybe the cool spring has spread out the adults from emerging?
     
  6. turf hokie

    turf hokie LawnSite Silver Member
    Posts: 2,744

    ^^^^That is what had me wondering, are they late hatching or early developing?? Or did I just come across an a few anomolies in my garden??

    I too did not notice a normal flight of beetles. Much shorter window and many fewer noticed. But then again, not much has been normal here this year. Or are we just not in a big flight year?

    I feel like just putting my head in the sand for a week or two..........maybe the grub thing and all the fungus we have right now will go away on its own
     
  7. Whitey4

    Whitey4 LawnSite Silver Member
    Posts: 2,448

    I am beginning to think the weather might have done something to either reduce the grub population, or made the hatching season sporadic....

    But, if that is the case, this same weather has really forked up some of my best lawns with fungus. I've seen dollar spot before, but never so bad that the grass is covered with white hairlike fungus in the morning, and by afternoon it's a 2 to 6 inch straw colored dead spot.

    I've hit my own lawn with 4 fungicide apps this year, even changed up the AI and still have some damage. The worst damage on other lawns seems to be in areas that get no morning sunlight. That white hairlike stuff shows up, it leaves a DEAD spot. Again, only in areas that get no morning sun.

    Late emerging/growing clover has also been a PITA this year. CB, not so bad.... yet.
     
  8. EVM

    EVM LawnSite Senior Member
    Posts: 371

    The dollar spot is ridiculous this year. it is every where. Anyways I was wondering about the grubs too. I think the temps could favor a little late Merit treatment but it is August now so it is too late.
     
  9. mictrik

    mictrik LawnSite Member
    Posts: 245

    I applied it a few hours ago and gave it a good watering with the hope that the evening watering will accelerate the time it takes for the grass roots to take it up. I guess all i can do is wait, see and be prepared with some Dylox. I can only go by what I see on my lawn as I do not have the experience of many lawns like most of you so I really appreciate the input. I am also wondering if the wet and cooler summer has an effect on the grub life cycle. Hopefully you guys can report your findings as we go into summers end...
     
  10. Whitey4

    Whitey4 LawnSite Silver Member
    Posts: 2,448

    DO NOT water at night, ever, especially THIS year! The fungus problems on LI are at a 4 decade high, (meaning 40 years) and night watering only invites another problem.
     

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