How can I repair yellow patches on St. Augustine grass?

Restoring grass to bare spots on your lawn caused by dog urine, piles of leaves or objects remaining on the grass too long can best be accomplished by overseeding. Here are a few steps to ensure the best results for your efforts.

Start by raking away the leaves, dead grass or thatch to expose bare soil wherever the turf has completely died. Grass seeds need to be in contact with earth before they will grow.

Overseed the spots with grass seed and rake lightly to put the seed in direct contact with the soil.

Apply more soil on top. Spreading it out until it is about 1/4-inch thick.

Give the newly-seed area a good watering with a sprinkler and continue watering daily until the new grass is established.

If you live in a hot climate, those yellow spots could be chinch bugs. You need to apply a lawn and insect repellant to your lawn and keep it watered well. St. Augustine requires a lot of water until it gets started.

Hi Hilda, sorry your grass is turning yellow in patches. Hope this information helps you. Repair A Damaged Saint Augustine Lawn - Saint Augustine ...

1. https://saintaugustinelawncare.com/st-augustine-lawn-repair/189-repair-a-damaged-st...
2. A broadleaf weed spray will control the majority of weed types in Saint Augustine grass. If other weed sprays are necessary, then look at these once the lawn is returned to good health. Be sure to use a weed spray labelled SAFE for SAINT AUGUSTINE GRASS. Using the wrong weed spray on Saint Augustine lawns could severely damage the grass.
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5. First Lawn Fertilizer ApplicationMeasure up the lawn and apply a good quality lawn fertilizer with trace elements at manufacturers recommendations. Being careful not to over-fertil...
6. Ongoing Fertilizer Applications During RepairWe can apply fertilizer a little more frequently during repair but at much lower rates.Instead of waiting two or three months until the next applic...
7. Making Progress to Repair The LawnSo far we have added nutrients to the Saint Augustine turf in the form of fertilizers, we have stopped using the area for any type of wear and tear...

Why Is My St. Augustine Grass Yellow? | Hunker

1. https://www.hunker.com/13405105/why-is-my-st-augustine-grass-yellow
2. Chemical Concerns. Whether dry or liquid, chemicals can damage a lawn when spilled by accident, causing yellow or brown spots. Lessen the chance of spillage by using a funnel when dealing with chemicals, such as gasoline for a lawn mower, near your lawn. If you spill something on the lawn, flood the area with water,...

Dee is right, If cinch bugs are left untreated they can destroy you lawn in a VERY short time!

You'll have to Reseda next spring. St Augustine unfortunately does not spread and therefore will not self correct.