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What’s Causing that Brown Spot in My Lawn?

June 21, 2013

I want to help you become your own brown lawn detective.  To see how to approach this subject this year I looked back at some of my older blog postings about lawn insect, fungus and other problems that can cause your lawn to turn brown during summer weather.  I decided the best way I could help you diagnose your own lawn problems is to make it easy for you to find the info and pictures you need.  I have two links to help.  The first is a link to a posting I did last summer that will help narrow down the cause of you brown spots (click here to read).  The second is a link to show you specific lawn disease or fungus problems (click here to read).

Hope these two postings help you answer your lawn brown spot questions.

Brown Patch on Tall Fescue - Circular patches of dead grass are a symptom of several lawn fungus problems such as Brown Patch and Summer Patch show up during periods of warm temperatures and high humidity.

Brown Patch on Tall Fescue – Circular patches of dead grass are a symptom of several lawn fungus problems such as Brown Patch and Summer Patch show up during periods of warm temperatures and high humidity.

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53 Comments
  1. Joe F permalink

    Ashton,
    My lawn was in great shape and then I used scotts weed and feed around may 11. I think the weed and feed is browning the lawn. It seems very consistent through out the lawn. We have been getting a crazy amount of rain here on Long Island and has been steady in the mid 70’s but starting tomorrow we are moving into 80’s and clear. What product should I use to correct this? Or do you recommend waiting a few weeks then applying summer guard. Please help, I would like to get the lawn back on track before we get into the hot summer months.

    • Hi Joe I am not sure what may be causing your lawn to brown. Turf Builder SummerGuard would provide protection from the kind of insects that can cause your lawn to brown and thin. You can apply 6 weeks after your last feeding. I am wondering if you have a fungus problem. Look for spots on grass blades that are in the process of turning yellow then brown. Scotts Lawn Fungus Control would stop this problem. Good luck.

  2. Joe F permalink

    I think it may be a fungus problem. If I use the scotts fungus control do I skip the summer guard or can you apply it at a later period.

  3. Kevin permalink

    I am currently suffering from the same issue. My lawn was thick, lush and a beautiful dark green. To be honest is was a pain to mow since it was so thick. Two weeks ago, I noticed there were a few yellowish-dry looking patches, it doesnt seem possible that the lawn was dry with all the rain we’ve been getting on Long Island. Then I started to consider my application of Scotts with the Halt Crabgrass killer and figured maybe it was working to prevent weeds from forming. My neighbors a big lawn guy as well, and he seems to think some type of disease or perhaps the lawn was too thick and began to smother itself. Do you think I should attempt the Fungus Control as well?
    Thanks

  4. Joe F permalink

    Ashton- it was not a fungus. It was a grub problem for my lawn. The blades of grass were brown like straw and there was no specific pattern. I also carefully examined the other blades of grass and they were fine. not brown then green, etc I then used a flat shovel and dug up a square of the lawn. Underneath the grass was grubs. Treated for grubs.

  5. hello, I live in south florida and have st Augustine grass. we went away for 10 days and came home to a side yard that is straw brown and looks dead with sprigs of green patches. the area under the tree remained to grow and looks fine and the area that borders the drive way is still green. the grass was put in maybe 3 months ago by a neighbor since we share that side it looked fine before we left???? can I save this area and bring it back to life? please help!
    thank you

    • Hi jencfk
      Sorry about your grass. Since your problem is mainly in the sunny areas, it is likely chinch bugs. Hopefully you can treat before they kill your lawn. Put down Ortho Bug B Gon MAX and water after spreading. Then feed your lawn Scotts GreenMAX. Hope this helps.

      • thank you,
        what is likelihood or time it will take to see this problem corrected?
        I was surprised it could occur at such a great speed
        I will try to get this done asap!
        thank you again!

      • Hi jencfk If you caught the problem in time, you should see new growth a week or so after treating and feeding.

  6. Chris permalink

    I have found that the brown spots have been appearing on my lawn because of my two dogs urinating in the same place. The spots are a huge mess and look really dreadful. I spent years trying to sort this out by rushing after the dogs and sprinkling water on the patches, just after the dogs had been for a pee…

    …until I found Dog Rocks. They are a really cool product which just simply stop the dog’s pee from messing up the lawn. I cannot recommend them enough. Have a look online – they are available to order.

    • Hi Chris
      Thanks for your suggestion. Preventing is better than repairing. If repairing is needed Scotts EZ Seed Dog Spot Repair can be used.

  7. Hi Ashton..

    I’m into another season with the lawn looking good after 3 consecutives years of severe brownout each of the last 3 summers and seeding in the fall. Last applied Turf Builder 5 wks ago and we’ve had nice rain and almost 7″ in June. I put down Grub Control in early June. Going forward, you told me in year’s past that my brownout is probably fungus as it starts in August when it’s real humid. When should I apply the Fungus Control and how often? Also, considering no fert for the 1st time this summer as my brownout in previous year’s happened a few wks after my July fertilizer treatment…any thoughts?

    Mike

    • Hi Mike Farish Suggest you get the Lawn Fungus Control down when you see the first sign of a “patch” forming. Sometimes the grass in these patches will first take on a “darker, smoky look” or it will look a bit stressed. This is sometimes easier to see with sunglasses. Or, you could apply when you are starting to see high humidity/temps and night temps/humidity that does not drop much from daytime. Hope this helps.

  8. John permalink

    We found the same problem Chris – dogs had been ruining our lawn for years all whilst we were frantically trying out new grass/fertilizer – the lot! We’ve been using Dog Rocks for a long time with great results. Just need to stop them digging the grass now…!

  9. Lee permalink

    Ashton,
    I have missed fertilizing this Spring season because i was so busy with work. I have recently bought the Turf builder weed and feed. Is it too late to fertilize now? I am in the Northeast. Also it has been raining every day for the last week. On the bag, it says that it should not rain for a day after putting down fertilizer. Is that because the rain washes away the fertilizer? Thanks.

    • Hi Lee
      You can still put down the weed & feed. The reason you do not want rain or irrigation for 24 hours after applying is you want the weed control to have time to be absorbed into the weed leaves (that is why you apply to moist foliage so the particles will stick on the weed leaves, putting down when there is morning dew is great). The only caution I would give is to not apply if your temps are getting anywhere near 90 or above that day, temps in the 70’s to low 80’s are best.

  10. Lee permalink

    Thanks for the reply Ashton. One more question about the turf builder weed and feed. On the bag, it says you cannot use that feed more than twice a year. Reading your posts, it sounds like we are suppose to feed every 6 weeks. Does the bag mean you just cannot use weed and feed more than twice a year but you can use other feed such as summer guard / winter guard feed?

    • Hi Lee The twice a year note on the Turf Builder Weed & Feed bag is for the weed control portion, which should not be needed more than twice a year. You are right, it is best to feed your lawn one of the Turf Builder products on a 6 to 8 week schedule during the growing season.

  11. Joe F permalink

    As we discussed, treated the grubs and the treatment treated for all other types of bugs. I am at my 6-8 week cycle and I would like to fertilize. What product would you recommend to keep the remaining grass green and strong for the hot weather here on Long Island this time of year?

  12. Joe F permalink

    Also, should I wait at least 2 weeks from the grub treatment to fertilize?

    • Hi Joe F… If you had not treated for bugs, I would suggest Turf Builder SummerGuard, if you have treated for bugs with Ortho Bug B Gon MAX and it has been 6 to 8 weeks since your last feeding, you can feed with Turf Builder or Scotts GreenMAX. I would only wait a week between putting down GrubEx and feeding.

  13. Lee permalink

    Hi Ashton,
    I am having clover problems all over my yard. I have patches of clover here and there. I have tried using Ortho weed b gon Max but it did not work on the clovers at all. I was thinking that Turf builder weed and feed might help but it has been raining like crazy here and 90 degree weather so i have not been able to put it down. What is the best way to get rid of clover? Thanks.

    • Hi Lee… There are many kinds of clover. The product that I have used with lots of success is Ortho Weed B Gon Chickweed Clover and Oxalis Killer. I have used it with the Ortho Dial N Spray hose end sprayer.

  14. Lee permalink

    Hi Ashton,

    How do you store unused fertilizer? Will taping the opened bag help even though its no longer air tight? How long can I store this fertilizer for? Last fall I had some left over fertilizer that i left in my basement. I tried to use it in the Spring and it caused my grass to brown. I am guessing i cannot store it for that long? Thanks.

    • Hi Lee… You can tape the package closed and store in an area where it will not pick up moisture. If the granules stay dry you will be able to use for several years.

  15. John Steger permalink

    If there is a possibility of having insects in your lawn or getting a lawn fungus, would it be reasonable to just put down GrubX and Scotts Fungus control each year as a preventative? My lawn looks good, but occasionally I get some brown spots and don’t know if it is because of insects or fungus. Any suggestions?

    Thanks

    • Hi John Steger
      You can have both lawn insects and a lawn fungus at the same time. If you know your lawn is prone to grub problems and you are getting patch type diseases in the summer, GrubEx and Scotts Lawn Fungus Control can provide prevention.

  16. Joe F permalink

    When is the best time of the day to put down turf builder? Also, lawn was mowed Saturday morning. Do you have to wait a certain amount of days after the lawn is mowed to apply turf builder? Last, how long should I keep the kids off of the lawn once the turf builder is applied? Thanks for the help!

    • Hi Joe F
      Turf Builder can be applied anytime to wet or dry foliage. Watering after applying will get the feeding going. There is no waiting time for kids to go on your lawn after spreading Turf Builder. Some of the combo Turf Builder plus products have specific directions about going back on the lawn after spreading.

  17. Bob A permalink

    Hi Ashton,

    I’m in SW CT, we have a had a lot of rain in the last month and a half which has caused both a brown spot fungus issue and an increase of insects. I applied Summerguard this past Thursday and have some questions:

    When can I apply Fungus Control as its only been a few days since applying Summerguard?
    Do I need to apply the Bug B Gon Granules for another three months control or will the Summerguard provide bug control for three months? (Applied bug b gon previously in April)
    If so, when should I apply after putting down Fungus Control?

    • Hi Bob A
      You can put down Lawn Fungus Control a week after Turf Builder with SummerGuard. Turf Builder SummerGuard will give you about 6 weeks of insect control. That will take you to around Mid August. You may need another application of Bug B Gon MAX granules if you are seeing lots of lawn moths in your lawn when you mow. If not, you can skip another application and just do a Turf Builder feeding in late August. Bug B Gon MAX granules provide up to 3 months of protection when you use the “heavy” spreader setting rate.

  18. Lee permalink

    Ashton,
    About 3 weeks ago, I was digging up some weeds in my lawn and I found some beetles in my ground. I got grub EX and sprayed it using the spreader on my lawn. I watered it the day after which it says that activates it. Yesterday, i was digging weeds up again and still saw a bunch of beetles where i was digging. I thought the grub EX was suppose to be able to kill beetles? Did i put down the grub EX too late in the season?

    • Hi Lee Your application of GrubEx protects against the next round of grubs in late summer that will hatch from eggs of adult Japanese Beetles and several other species of beetles. The beetles you saw are likely “Ground Beetles” that are not damaging your lawn. GrubEx will not kill beetles, just the young grubs after they hatch.

      • Jon permalink

        I have pretty severe brown patch (similar to the pic in this article) and was wondering if I use banner maxx, will the grass come back?

      • Hi Jon
        Banner is a good systemic fungicide. If you catch Brown Patch early enough your grass will grow back in that area. It is worth a try. If you have one of the cool season grasses, like fescue, hold off feeding until we get to early fall. Scotts Lawn Fungus Control is also a systemic that is good on Brown Patch (the active ingredient is different from Banner).

  19. Lee permalink

    Hi Ashton,

    Thanks for the reply. I have 2 more questions.
    1. I am planning on doing some seeding in the fall. Should i do it in Sep or Oct? Also i have Turf builder weed and feed left over. Should i apply that 4 weeks after i seed or use the winterguard?

    2. I have a whole bunch of clovers in my yard. Should i wait for next spring and use Turf builder with halts? Will that stop the clovers from coming up next spring? Or do i need to use Ortho Weed B Gon Chickweed Clover and Oxalis Killer?

    I live in New Hampshire. Thanks.

    • Hi Lee
      Early September would be a better seeding time in your area. New grass would have to be mowed 4 times before using a weed and feed. You might save your weed and feed till next spring if you do not have time this fall. I would spray the Clover now with Ortho Weed B Gon Chickweed and Clover Killer. Turf Builder with Halts will not prevent clover. Clover is a perennial plant and comes back each year from the roots.

  20. Lee permalink

    Hi Ashton, thanks for the reply. I am about to apply a round of weed and feed right now. Can I put down the Ortho Weed B Gon Chickweed and Clover Killer at the same time as the weed and feed or do i have to wait for some time?

    • Hi Lee… You will see better clover control at this time of year with the Ortho Weed B Gon Chickweed and Clover Killer than with the Weed & Feed. You should allow about a month between applications. Check the labels for time to wait to plant grass seed this September, you may not have enough time to use both products this summer.

  21. Brian V permalink

    Hi Ashton,

    I live in zip 10710 and my lawn is looking spotty and slightly weedy. My last weed/fertilizer application was about 7 weeks ago. I want to get it back to being the way it was about 3 months ago(green and lush). It has been extremely hot and humid here in NY and somewhat dry. I have been watering about .5″ every 4 days. What application do you suggest I use now to try and keep my lawn lush and weed free for the rest of the hot summer? Any other recommendations?

    Thanks in advance.

    • Hi Brian V… Suggest you feed with Turf Builder SummerGuard. This will feed your lawn while protecting against the kinds of insects that like to thin the lawn and cause it to turn brown in summer. You can spot spray any weeds with Ortho Weed B Gon MAX plus Crabgrass Killer.

  22. Peyton permalink

    Ashton,
    We are in central Texas. I have applied Scott’s Summerguard with Turf Builder and now there are brown, wilting patches. I have pulled the grass and they stolons of the St. Augustine are mushy and brown. We have received alot of rain in the past month and it has been very muggy at night. Is this a fungus problem? If so, what do you reccomend?

    • Hi Peyton
      There are two fungus problems that can show up on St. Augustine when you have the kind of weather conditions you described. One is Brown Patch, which will show up as circular brown areas in your lawn about a foot in diameter that first turn a grey color before turning brown. The second is where individual grass blades have dark colored spots on them and the grass plants start to brown in a more random pattern. Both of these conditions can be treated with Scotts Lawn Fungus Control.

  23. Jac permalink

    I just sprayed my lawn for weeds yesterday afternoon, but I also need to treat a fungus problem (just moved in) When can I do this? I live in eastern, but not coastal, North Carolina.

    • Jac permalink

      It’s centipede grass. Not sure if that makes a difference

    • Hi Jac
      I like to allow a week between these kinds of applications. Wondering what kind of fungus problem is active in your lawn right now? Earlier in the fall you may have had some Brown Patch in your area, however with the cooler temps this tends to go away on its own. Rust and Powdery Mildew can be a problem in fall. If you have Fescue, you can feed this time of year and both of these problems can be diminished.

  24. Celeste sodano permalink

    I just had my lawn treated with weed and feed. How long do I have to wait before I can apply Scott’s fungus control?

    • Hi Celeste Sodano
      Allow a week between applications. Good luck with your lawn.

      • Celeste Sodano permalink

        Wow thanx. Next question I have a weed I think is called horsetail. It looks like a miniature CHRISTMAS tree. How can I kill it? It’s starting to invade my lawn/flower garden. Help.

        Sent from my iPad

        >

  25. Hi Celeste Sodano
    Horsetail is very difficult to control. From your Christmas Tree description, I believe that is what you have. I have even heard reports that this weed is difficult to control with a non-selective control like Roundup. I would think that in a lawn the repeated mowing would weaken it since it wants to grow taller than your grass. In your other areas, understand that it puts out a lateral root system between plants that runs parallel to the ground surface. Be careful not to cut this root or break it into smaller pieces as you try to remove it. These smaller pieces will create new plants. Good Luck.

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