http://www.griffin.uga.edu/caes/turf/Publicat/AnnualReport2002/TURF2002.pdf http://www.agry.purdue.edu/turf/report/2004/p121.pdf Check out these reports. I have always used pendimethalin, but it looks like I may be changing to Dimesion. In the U of Georgia report, split apps of Dimension gives 90% control after 3 months. In the Purdue report, test plots with split apps of dimension applied only have 5% crabgrass after 3 months. What does everyone else think about the studies?