I have done the search and did not really find my answer to the age old question. How to combat crabgrass in late summer in time to reseed this fall. In KY like many other areas. The best time to seed is August 1 to October 15. The problem is that the crabgrass is really bad in some of the lawns that I am going to reseed this fall. I have used Drive 75 in the past but it has been inconsistent on controlling the weed. I have used MSMA that stuff will burn a lawn in a heart beat. I was wondering about Tri MEC PLUS. I also was wondering about this product being applied with the Perma Green.