Why do some lawns have yellow patches?
Question:Besides insects and irrigation issue what else could be the cause for that?
Answers:
dog urine.
salt from sidewalk clearing of snow comes to mind or over fertilized as in spilt while reloading spreader.
From my experience with our own lawn, areas that get a lot of sun tend to dry out more quickly than other areas, and may require better watering. Sometimes, if you have a lawn that is a lackluster grouping of different types of grass, including crabgrass and weeds, you may need to reseed the lawn to make it healthier.
A lot of factors can contribute to patchiness of your lawn, from the type of soil you have underneath, your location, pests and rodents, etc. But the best advice that I can give is to reseed and water your lawn. Watering it on a daily basis could help.
Irrigation- causes shallow roots. Grubs- cut the roots of the grass. Also if there was a dog urinating in the yard the soil may have acidified and the pH needs to be corrected with lime, or pelletized gypsum. It could also be a fungal disease which can be worsened by poor watering habits.
Most of the time in many yards its a disease, a type of fungus that grows in many types of yards..
Well I know you said besides insect issues but there is a hidden culprit you never see called "grub worms"..they stay underground and attack from the roots...they are white and easily seen..go to the yellow patches in the cooler part of the day...score the grass in 2 foot areas and pull it back..see if you see any of these..try in a few places..if so spectracide in a water hose attachable bottle spray will get them
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