Pre-Emergent Booster

[detrotirocker99]

I put down Pendimethalin on March 1st and am due for a booster this weekend. Do I have to use Pendimethalin again, or can I switch to Dimension?

I've used both the past couple of years, and was disappointed by the Pendimethalin application last Fall (I am certain it was laid down in time). My lawn seems to respond better to Dimension, but I don't want it to be a waste by laying it as a booster instead of the original treatment.