One of my customers just put some new zoysia sod in his back yard. the lawn is due for another pre m app plus the sod is having some crabgrass to come up through the sod, so obviously the sod needs some pre m as well. the question is, will the pre m prune the roots of the sod? The ai is pendamethalin and i will half rate it since i applied earlier this year. thanks in advance!