|My yard has St. Augustine grass and there are portions that are starting to yellow and thin out. Started out a small spot and then spread. Why is that and what can I do to fix? We recently had heavy rain for about 2 weeks straight. Not sure if the yellowing started before or after.|
|Yellowing turf can indicate an insect problem (chinch bugs, grubs), or a need for fertilizer or even a need for iron. I can't really diagnose the problem without seeing it. Here's a website from Texas A & M with photos of St. Augustine infested with chinch bugs. http://insects.tamu.edu/extens...
Check out the photos to see if they match. If not, here's another helpful publication: http://www.ci.austin.tx.us/gro...
Hope these help you determine the cause of the yellowing in your lawn.