Hi! There have been these white patches in my lawn this summer. I used the fungus control (attached) 2-3 times so far this summer to treat but they ke...
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White patches in lawn #766603
Asked August 09, 2021, 6:19 PM EDT
Hi! There have been these white patches in my lawn this summer. I used the fungus control (attached) 2-3 times so far this summer to treat but they keep coming back after disappearing for a short while. Are they some sort of fungus? Is the fungus control that I used the right one? Is it due to drought or over-watering? We have been watering 2-3 times a week, multiple hours each time. The grass are in fairly good shape considering the heat and drought but these white spots keep showing up. Appreciate your help, thanks very much!
From your lawn monoculture, I would guess that you are using herbicide of various kinds. When the labels say that they do not kill grass, that means at the levels that do kill weeds. Sometimes we see this kind of damage from from high concentrations of weedkiller that is spilled on the turf.
Sometimes we see this damage from the spot application of a herbicide.
This does not look large enough to be grubs.
I need more information about how you care for your lawn.
Hi Steve thanks so much for your quick and detailed response!
I thought about powdery mildew too, but it's not really powdery on the grass surface, instead the grass itself turned white.
Dog/deer urination is possible, but we actually see deers more often in the backyard than the front and our back actually has less those white spots.
Herbicide - I did spray once a few weeks ago but mainly the driveway edge. And you are right I did some spot applications in somewhat heavy dose of weedkiller (the one that connect to the hose) but again I did that much more in the back than the front and the back has less spots. If this is the reason do the white patches show up exactly at where I applied spot application or it can be somewhere else (it does look like they show up at different places)? And is there usually a time lag (quite some time after I sprayed)? This year I have relied on pulling weeds a lot more than spraying weedkiller to avoid hurting the lawn too much.
Other than all these, I fertilize in the spring and in the fall. I mow every 7-10 days at 4 inches. I have been watering much more this year, 2-3 times a week, as much as 5+ hours each time. The current spots showed up after some heavy watering and the rain over the weekend which makes me wonder if over-watering is a possible reason?
