Yellow spots in lawn

Discussion in 'Fertilizer Application' started by LawnsharkMB, May 8, 2014.

  1. LawnsharkMB

    LawnsharkMB LawnSite Senior Member
    Posts: 580

    I just started mowing this lawn this year and the lady does her own fertilizer. When I saw these spots I knew she had to have just put down fert and got it heavy in spots but she claims they showed up before she put down the fert. I see these spots as well in areas that hold water but we haven't had rain in a couple weeks here. Is there anything else this could be? I'm leaning towards the lady just doesn't want to admit she put down too much fert.

    spots1.jpg

    spots2.jpg

    spots3.jpg
     
  2. dKoester

    dKoester LawnSite Gold Member
    Posts: 3,242

    Check for chinch bugs, then probe for underground rocks or debris then soil test the areas affected for nutrient levels.
     
  3. dKoester

    dKoester LawnSite Gold Member
    Posts: 3,242

    That yellow turf , it just might be those bugs.
     
  4. Jcl4slc

    Jcl4slc LawnSite Senior Member
    Posts: 259

    100 percent positive that is pythium blight. I been dealing with it in all my yards down south. Only type of fungicide that will kill it is a strobilurin fungicide such as heritage g. This will not go away and will kill the yard and spread like wildfire when fertilized.
     
  5. Jcl4slc

    Jcl4slc LawnSite Senior Member
    Posts: 259

    This is a fungus that is in the soil that kills the roots cause by too much water. The highlighter yellow is where it's spreading and will soon die. Be careful because you can carry pythium to other yards while mowing.
     
  6. dKoester

    dKoester LawnSite Gold Member
    Posts: 3,242

    They haven't had much rain..............not pythium.
     
  7. dKoester

    dKoester LawnSite Gold Member
    Posts: 3,242

    Do the white paper test. If the buggers are there you will know.
     
  8. Jcl4slc

    Jcl4slc LawnSite Senior Member
    Posts: 259

    He stated that they are in spots that hold water. The customer fertilized .The south has had a ton of rain . It has every characteristic of Pythium. Rain or not the oospores are still in soil unless treated. Nitrogen exploded it. Nymphs have not started feeding yet. There is no way for that much damage in early May. Treat it for pythium.
     
  9. LawnsharkMB

    LawnsharkMB LawnSite Senior Member
    Posts: 580

    You're right we have had a ton of rain but it's been dry the past couple weeks. Usually when I see this yellowing after a heavy rain it goes away once it's dry for a while but these spots have not.
    Posted via Mobile Device
     
  10. Jcl4slc

    Jcl4slc LawnSite Senior Member
    Posts: 259

    It does not matter if it's been dry. Pythium is not a normal fungus and classified as a parasitic oomycotes. A whole different beast is in the soil. That's your problem. Those spots are dead is why they are not coming back. The roots are gone. Yard looks like grease spots everywhere? The yellow that is the color of highlighter will soon be dead if treated with an insecticide. I've probably treated 20 yards already just like this, this season. Your not gonna have chinch bugs destroying yards when soil temps have not even reached 75 degrees consistently in SC. That much damage already you would have to be blind not seeing bugs when looking.
     
    Last edited: May 9, 2014

Share This Page