leaf wetness and disease prediction on turf grass

Discussion in 'Pesticide & Herbicide Application' started by ant, Feb 20, 2001.

  1. ant

    ant LawnSite Silver Member
    Posts: 2,431

    any of you do any work on leaf wetness and turfgrass disease prediction.
    anthony
     
  2. Forever Green Lawn

    Forever Green Lawn LawnSite Senior Member
    Posts: 280

    There are some computer models that predict diseases based on leaf wetness, air and soil temps, relative humidity, soil moisture and amount of rain. From what I've seen they over predict. As for us predicting a disease, you must keep several factors in mind, more that just leaf wetness. List what diseases are common on the lawns in your area for that season. Figure the weather conditions necessary and what the current weather is like. For example, Leaf spot (Bipolaris & Drechslera) is a common Kentucky bluegrass disease. You can start to see it in May if the weather has been wet and turns hot and humid and then rainfall occurs. It's most severe when the temps are in the 80's or higher. If the current weather matches up with the necessary weather for the disease, then you should be on the look out for it. This is by no means a fool-proof system. Some lawns will get the disease and others won't. Depends on many factors, like amount of thatch, shade, cultural practices, and other things. I hope this helps some.

    Scott
     
  3. Garry

    Garry LawnSite Member
    Posts: 184

    Water accounts for over three quarters of the quanitive weight of a grass plant. Imperative to the plants survival, a 10% reduction in water content is enough to cause injury and/or the death of the plant.
    Between natural rain, dew, and proper irrigation, the plant spends much of its time wet. Most fungal activity requires water to complete its life cycle, and it goes without saying, if you are observing a stand of living turf the chances are good water's present.
    Scott is correct. If the pathogen is present AND the conditions are right, infection WILL occur. It's better to keep your eye on the temperature. Snow mold does not occur in July and brown patch will not be found in March.
     
  4. ant

    ant LawnSite Silver Member
    Posts: 2,431

    thank you both for your replys...
    they helped...
    anthony
     
  5. ant

    ant LawnSite Silver Member
    Posts: 2,431

    got some new guys on this forum. what do you think.
    ant
     
  6. osc

    osc LawnSite Senior Member
    Posts: 502

    Try bent grass on a putting greens in the shade on a humid creek bottom in May through September You don't wait and watch, you get out your Visa card and blow 500 dollar chunks on fungicide every 2-3 weeks.
     
  7. groundsguy1970

    groundsguy1970 Banned
    Posts: 166

    Like THE CRYSTAL METHOD said:" THAT'S THE NAME OF THE GAME!"
     
  8. anthony

    anthony Guest
    Posts: 0

    i reposted this
    see if we can get more replys
    anthony
     
  9. Russ

    Russ LawnSite Senior Member
    Posts: 539

  10. anthony

    anthony Guest
    Posts: 0

    russ:
    thanks for the reply...what a great link...
    anthony
     

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