I wouldn't recommend them as they're meant as pre-emergents during seeding. They certainly won't do wonders to the bentgrass as Tenacity does have an impact through the roots, but it isn't as effective as the sprayed product would be (which would have an effect via the spray and, secondarily, again when washed off into the soil where it works both as a pre-emergent and root-active ingredient).

This is apart from the fact that the fertilizers are starters as well, so the phosphorus levels are very, very high compared to the nitrogen levels. I wouldn't necessarily object to using this once...but there are considerations where even that might be a slight issue. We simply don't know if that's the case without a soil test.

Personally, I'd use the spray, target the worst areas to start, and continue on that way until you conquer the problem.