We got the contract on this new business which the sod went down at the end of April. We could not get down any pre emg. Now the foxtail in all over, I mean one or two plant every sq ft. Property has 20000 sq ft of turf. We have controlled all weeds except foxtail. The propety is irrigated and looks like s%$@t. We treated it with drive 75 about a month ago, but soon after (4hrs) we had a suprise pop up rain. One week later the leafs were turning red so I thought I had control anyway. After one mowing the foxtail looks the be growing again and healthy. Any suggestions???