Next weekend I'll pre-m my yard. Partly because I spent the last several winters away a fairly big portion of the yard (12x25-ish) is completely overrun with crabgrass. Assuming the pre-m works (In the past, including last fall I've had good success with pendamethalin although I will have to look at barricade and see if I even have whatever it takes to put it down) Anyway, I'll have a bunch of sand in a high traffic portion of my centipede lawn (decline and missed maintenance is how the crabgrass got started to begin with). I'll need to sod with either centipede or St. Augustine. Will either be effected by the pre-m? Does anyone have any preference/suggestions for high-traffic, full-sun southern lawn? Thanks!