White Residue on grass blades(link to pics)

Discussion in 'Pesticide & Herbicide Application' started by sandwedgeking, Apr 25, 2012.

  1. sandwedgeking

    sandwedgeking LawnSite Member
    Messages: 5

    Applied 19-0-0 w/.10% Dimension Crabgrass Control last Thursday (4/19). The following Monday (4/23) got a call from a customer saying it looked as though someone sprayed white marking paint or spray paint to areas of the lawn. I thought she was crazy, but when I got there I saw what she was talking about.

    Although subtle, tips of grass had white powdery residue in areas of the lawn. Looked at a few others I fertilized and they all had a little here and there. Next door neighbors do not have it.

    There is no shade on any of these and the weather has been in the 50s during the day, upper 30s at night. It did rain the afternoon and evening following the application - about one inch. I couldn't imagine it is Powdery Mildew...just not the right environmental conditions.

    The first few pics are from the lawn I did, but whilst out walking the dog, saw another lawn in a different part of town that I don't maintain had the same thing but much more noticeable. Snapped some additional photos.

    The fertilizer wasn't dusty and I clean the spreader every other day. Has anyone seen this before?

  2. Dbry12

    Dbry12 LawnSite Member
    Messages: 50

    Does it wipe off easily? It does look like powdery mildew but im still learning and dont know every disease.
  3. agrostis

    agrostis LawnSite Silver Member
    Messages: 2,529

    That look's like a slime mold. And that doesn't hurt the grass. But, you just fertilized. You had a heavy rain afterward, but the temperature's aren't conducive for fungus. But something is going on there. What's the humidity like ? What part of the country is that ? Do those area's have restricted air flow ?
  4. sandwedgeking

    sandwedgeking LawnSite Member
    Messages: 5

    The stuff flakes right off. There is no damage to the leaf - the blades are green. This is in Green Bay, WI. Humidity is low and has been. Temps are a bit below normal for this time of year. All these lawns are wide open, in direct sunlight.
  5. agrostis

    agrostis LawnSite Silver Member
    Messages: 2,529

    That's beyond what i know. If you really want to know what that is, have a fungal pathologist at your state university identify that for you. They will probably do that for free. That is the kind of thing that get's those guy's excited.
  6. RigglePLC

    RigglePLC LawnSite Fanatic
    Messages: 13,670

    I think I have seen it before from time to time. Yes, it is from the fertilizer, but I think it is probably due to wetting and drying of the foliage and fertilizer granules--condensation of dew most likely, but frost could be involved. No problem, it will disappear in a few days. Or you can water it to wash the residue off the grass blades.
    A rare happening...conditions have to be just right.
  7. tlg

    tlg LawnSite Senior Member
    Messages: 651

    I don't think your application had anything to do with the problem your seeing.
    As Agrostis said it looks like Slime Mold. I would agree. An inch of rain, excessive thatch, prolonged leaf dampness and poor drainage could cause it to develop. It will most likely clear up on it's own. JMO
  8. Snyder's Lawn Inc

    Snyder's Lawn Inc LawnSite Platinum Member
    Messages: 4,530

    Im with this guy
    I have had it happen to me few times
    Always after Lawns been fertilized most time when run out the good stuff have buy some cheaper stuff
    Proscape Mesa I normaly use its doesnt show up only I use Ag dusty Fert shows up Like Riggle said conditions have be just right
    Think The vapor off the Fert does it and notice more during cool weather
    Last edited: Apr 27, 2012
  9. kevin2012

    kevin2012 LawnSite Member
    Messages: 1

    Hi, I know this thread is old, but wanted to see how the lawn turned out. I have exact same situation. Applied fertilizer, next couple of days it rained, and we had snow/frost the following morning. I am seeing while lines appearing on the fertilizer application track.


Share This Page