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Q. Dear Neil: I have approximately 800 square feet of lawn that was St. Augustine, but that now has bermudagrass encroaching. I always thought that St. Augustine was the more dominant grass and that it would prevail. I am not aware of any selective chemicals that will kill the bermudagrass and let the St. Augustine grow. What are my options?
A. You need to determine why the St. Augustine is thinning. It may be due to chinch bugs. They attack St. Augustine but seldom bother bermuda at all. Or it could be that the lawn simply got too dry. Bermuda survives drought better than St. Augustine. St. Augustine can also be weakened greatly by take all root rot in the spring and gray leaf spot in the summer. I really canât diagnose the problem and its solution without more information. You might do a little homework on each of those.