Ray, are you saying that Treflan could be applied without incorporation?  I always had the impression that trifluralin would break down when exposed to sunlight, therefore requiring incorporation.  Maybe I'm wrong on that.  Treflan would be great if I didn't need to incorporate (3/4 acres are no-till).

I found that Lasso would run about $12-14/acre for 2.5 qts/acre...ouch.