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South Florida- St. Augustine Dry, Gray Patches (HELP!)

3.7K views 12 replies 5 participants last post by  lcst116  
#1 ·
Hi, everyone.

So, I have Palmetto St. Augustine sod that was laid in November and it has struggled, but finally is turning a thick green!

Well, except for this one problem... there are these (what I can only describe as) gray, dry patches that keep coming back even after I water. I regularly water and fertilize my lawn

We even got rain last night, yet I come out this morning and these parts are bone dry (see attached pictures). It looks a lot worse in person...

I've applied RGS, Humic, and Air8 to all these areas, yet the grass keeps drying up to a gray straw. What can I do to fix this?





 
#3 ·
ionicatoms said:
Have you touched the soil itself to verify the moisture content? Insects living in the thatch or soil can also produce these symptoms. It's important to get the diagnosis correct, because localized dry spot treatment won't do anything for insects.
Hi, thanks for the response. I have felt the soil and it feels dry and grainy, even after the nighttime rainfall.

I've dug pretty deep into the soil and don't se anything like grubs, but there are a lot of little black bugs that fly over my lawn. Maybe gnats? Not entirely sure..
 
#4 ·
I recommend the coffee can test because it's simple and would help eliminate possibility of chinch bug or other bug. Cut off both ends, place the can where the dry meets the lush green, run the hose in the cylinder for a couple of minutes and see if anything floats to the surface. If so, take a picture to help ID.
 
#6 ·
thundergunexpress said:
I recommend the coffee can test because it's simple and would help eliminate possibility of chinch bug or other bug. Cut off both ends, place the can where the dry meets the lush green, run the hose in the cylinder for a couple of minutes and see if anything floats to the surface. If so, take a picture to help ID.
I'll give it a try and post any results if I find them. Thanks!
 
#8 ·
CenlaLowell said:
Prepare to spray insecticide.
Hi! Sorry if I sound uninformed, but I was under the impression that bugs don't really start their harm until around June or July, which is when all the insecticides recommend application.

Is it too early for bug damage? I've already put a lot of things on my lawn (herbicides, fertilizer, fungicide, etc.) that I don't want to harm the grass by putting on more products than needed.

Thank you!
 
#9 ·
lcst116 said:
CenlaLowell said:
Prepare to spray insecticide.
Hi! Sorry if I sound uninformed, but I was under the impression that bugs don't really start their harm until around June or July, which is when all the insecticides recommend application.

Is it too early for bug damage? I've already put a lot of things on my lawn (herbicides, fertilizer, fungicide, etc.) that I don't want to harm the grass by putting on more products than needed.

Thank you!
You will come to realize that it's better to be to early then to late. Mostly because when you get any disease it takes FOREVER to get rid of it.
 
#11 ·
From UF website on southern chinch bug...

"Severe damage tends to occur from March through November in southern Florida and from April through October in northern Florida."

https://edis.ifas.ufl.edu/topic_southern_chinch_bug

But again, could just be a dry spot. Couldn't hurt to check though!
 
#13 ·
thundergunexpress said:
From UF website on southern chinch bug...

"Severe damage tends to occur from March through November in southern Florida and from April through October in northern Florida."

https://edis.ifas.ufl.edu/topic_southern_chinch_bug

But again, could just be a dry spot. Couldn't hurt to check though!
Thanks for the informative link! I decided to play it safe and sprayed some pesticide. Hopefully I'll see some positive results.