May 10, 2013

Apply Residual Herbicides as Close to Planting as Possible

By Mark VanGessel, Extension Weed Specialist; mjv@udel.edu

Preemergence herbicides will provide a period of residual weed control, based on rate and incorporation. Typically we can expect 3 to 5 weeks of residual control in most situations. So if our preemergence herbicide application is made 3 to 4 weeks before planting, we can expect weeds starting to emerge shortly after planting and a need for a postemergence herbicide application 2 to 3 weeks after planting. On the other hand, if preemergence herbicides are made at planting, they will provide enough residual control to allow postemergence application closer to canopy closure.

Source: Read More from Weekly Crop Update

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Filed Under: Commercial Ag Updates
About Mark VanGessel

Dr. Mark VanGessel is an Extension Specialist and Professor in Weed/Crop Management at the University of Delaware.

This is an archived post. For up-to-date recommendations visit the Weekly Crop Update @ http://extension.udel.edu/weeklycropupdate/

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