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Message: <blockquote data-quote="bigb159" data-source="post: 4296923" data-attributes="member: 51595">Pre-emergents are difficult because you need to time the application of the pesticide to the specific germination soil temperature of the weed you are trying to prevent. Usually we are talking late-September, early-October, but the weather will dictate the time. Most people are looking to thicken up their Fescue at that times as well, so you want to do the pre- at least two weeks before Fescue overseeding.That said, it's night and day if you can get the pre-emergent just right in the fall - your bermuda and zoysia grasses will start thin in Spring, with the absence of all the targeted weeds, and will spread more quickly into the gaps with the right amount of water and fertilizer.For dandelions, I missed the pre- window this year, so I spot sprayed them with 2,4-d post-emergent and it worked wonders.</blockquote>