re: Weed Identification Help - Brand New Lawn

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If I opt to treat it, is it too soon to spray anything on the new grass?

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Good article on Dallisgrass control LINK

Most herbicides specifically state on their label not to apply to newly seeded, sprigged or sodded lawns until the lawn grass is rooted and fully established. Usually at least 3 or 4 months. Read the label for any herbicide you consider using first - pesticide label information is always on the web so you don’t have go to the store or buy the chemical first in order when to find out when you can safely use it.