I had a problem with crabgrass invasion late last summer and fall on about 1.5 acres of lawn. I want to eliminate this situation and I am wondering what to use. Ultra Turf pre-emergent, Scotts halts with crabgrass preventer or Lesco Dimension pre-emergent. Is there really much difference and if so, what works best for you. Also, is application in early April about right for mid-michigan area? Thanks for any feedback.