Another VBW Thread

First, I would like to thank the posters on this board for providing so much useful advice on lawn care. The year over year improvement that I've had based on things that I picked up here has been awesome.

I treated my yard with MSM early in summer, I really havent had much of an issue with buttonweed this year. I will notice isolated clusters pop up occasionally and have been spot treating those about every 4-6 weeks. Last time I did it was probably at the beginning of august, I do notice there are several spots in my yard where some small clusters have reemerged. They are by no means taking over, but I wanted to know if it was would be worth the effort to treat these again now or if they will die off soon with the cooler weather coming? If it should be treated, I guess I am still good to use MSM as I have been?

Somewhat unrealted side note: I applied the dimension preemergent granules a few weeks back prior to that cool front that passed through. There was rain in the forecast so I didnt water in myself, but the forecast didnt deliver much at all. We have gotten some rain since, but it may have been several days after the application. Would it be risky to reapply?

BR Area