There are two stages to applying fall preemergent to lawns. Doc shows you what to use and how to put down pre-emergent on your lawn. The website page is here: https://goo.gl/f34Gjs there you can find the full product info.
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https://lawnmaintenancetips.com/fall-tips/fall-lawn-care-plan-for-bermuda-zoysia-centipede-and-st-augustine-lawns