24 AUGUST 2017
Being proactive is always preferred over responding after a problem appears, and this is why applying pre-emergent herbicides is such an important feature of any lawn-care provider’s business.
No one wants weeds in their yard, and the best way to go about eliminating them is to prevent them from growing in the first place. This is where pre-emergent herbicides come into play.
“Basically what they do is inhibit root growth, so the roots cannot expand once they come in contact with the herbicide,” said Dan Loughner, a field scientist for Dow AgroSciences Turf and Ornamental. “It stops the roots from growing essentially.”
Because pre-emergent herbicides aren’t killing the weeds but simply shutting down cell division so they can no longer grow, there is a LIMITED WINDOW of time to apply these chemicals so they can take effect before the weed germinates.
The general rule of thumb about when to spray or spread a pre-emergent is to apply the chemical two or three weeks prior to the emergence of the targeted weed. Crabgrass is the most common weed targeted and it tends to germinate when the soil temperature has been above 50 degrees for several days.
So, now that you know when, how do you decide what product to use and in what form to apply it?
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