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Message: <blockquote data-quote="Oklahomabassin" data-source="post: 2093113" data-attributes="member: 1546"><p>I honestly haven't been spraying in a few years to have a brand name pre emergent for you. You can definitely spray them at the same time. Keep in mind though, pre emergent will need to be watered to get to the soil surface. However, round up is a contact killer, (green vegetation) and shouldn't be washed off for 24-36 hour but after that time span sprinkle away to get the pre emergent down. The pre emergent will work best if its sprinkled dowm to soil within 48-96 hours.</p></blockquote><p></p>