Hi XXXXXXX. Thank you for asking your question on Just Answer. The other Experts and I are working on your answer. By the way, it would help us to know:-Could you explain your situation a little more?
What kind of watering program do you have for the grass?
Do you have an image of the problem area that you could upload here?
How often is the grass fertilized?Thank you again for trusting us with your problem. Please reply as soon as possible so that we can finish answering your question.
The problem is likely a fungus. Gray leaf spot is a possibility and is easy to identify. The grass will develop spots with purple to brown margins that enlarge and become elongated , sometimes diamond shaped. Some of the blades will become yellow. It is best not to let the grass remain damp. If can be controlled with fungicides. Examples recommended for gray leaf spot control, include Spectracide Immunox, Fertilome Systemic Fungicide, Ortho Lawn Disease Control, and Scotts Lawn Fungus Control. The problem is not likely Chlorosis or Nutrient Lock-Up since the entire area would be the same. It is difficult to diagnose a problem such as this without seeing the grass. Since you did checking on the net and found it resembled Gray Leaf Spot most likely it is. You might take a sample to a local landscape company to have them confirm that this is the problem. St. Augustine grass is susceptible to other diseases that can also be controlled with the same fungicides mentioned.
Should you require further clarification, never hesitate to ask. It would be my pleasure to clarify my answer to your question. If after reviewing the above information, you have additional questions, I will be glad to answer them. My goal is your 100% satisfaction with all questions I answer. Please click the green ACCEPT icon if you feel I have given a complete answer, and you can leave positive feedback. Positive feedback and bonuses are always greatly appreciated!Regards,EdwardAs always when using Just Answer your accept is required for me to be paid. By accepting you are agreeing that I have satisfactorily answered your questions. If you do not accept, your deposit if applicable, will remain in your account until you request otherwise. Please do not accept unless you are 100% satisfied with the answer and feel you can leave positive feedback.
Handyman
Handyman, Master Gardener, Plumber, Electrician, and Electronic Technician