Centipede grass is sensitive to many chemicals and this is especially true for active ingredients that target crabgrass. The one product we have that works well is ATRAZINE. It's Ok for the Centipede as long as you follow the label and guidelines we have listed in our WEED CONTROL ARTICLE. Once you get the crabgrass under control, it would be a lot better to stop it from ever growing by using one of the Pre Emerge products we have listed in the article.