Carpet grass in Bahia
let me start by say'n I read all 250 of the FAQ's about lawns. I didn't see anything close to my problem. 3 yeras ago I resoded my whole front yard with Bahia. I put in an irragation system as well. The yard was great the first year and a half. The the clover and weeds and such started taking over. I treated that with Trimec and that worked for a season. Now It's all coming back, but also "carpet grass" is VERY BAD. The Trimec didn't seem to have any effect on either the weeds or carport grass.
Submitted by BHGPhotoContest

There is only one solution to carpet grass: Kill the entire infested area and start over with new grass. Sorry -- there is no chemical that will selectively kill the carpet grass while leaving the Bahia alone. Before resodding, be absolutely sure that all the carpet grass is gone. Use Roundup, or if you don't mind the look and it's practical to do so, the "organic" solution is to just lay old carpet, plywood, whatever, over the area for a couple months. That does the trick too.

Regardless of which method you use, let the ground sit, exposed, for a few weeks before resodding. If any of the carpet grass comes back, you need to try again. Sometimes, it takes two shots.

As for clover, Trimec should work fine. A followup treatment commonly is needed, about 2-3 weeks after the first (read instructions carefully for precautions). New weeds will sprout from seed, so each year, you may need to go back and spot spray to kill the newcomers.

Answered by BHGgardenEditors