There have been several reports of poor control of grasses, especially weedy bromes and winter cereals following glyphosate applications that were made during the month of April, says Kansas State University Extension.
After a U.S. District Court vacated the registrations of certain dicamba herbicides, growers must find new ways to manage their weed control through a 3 step process.
In the Spring, growers may experience challenges when controlling winter annuals weeds or terminating cover crops with glyphosate-based burndown herbicide programs, specifically when glyphosate is sprayed in cool, cloudy weather conditions.
Source: University of Missouri, Kevin Bradley and Mandy Bish
Because of the dramatic swings in air temperature that we've experienced already this spring, we've received a few questions about the effect of air temperatures on our spring burndown applications. Specifically, most people are asking, "When is it too cold to apply a burndown herbicide?" and "What are the conditions that lead to poor weed control following a burndown herbicide application?"
Source: Larry Steckel, Extension Weed Specialist-University of Tennessee
What are some good options to control ryegrass with a short turnaround to plant back to corn? When addressing this question we have to realize that some of this ryegrass is likely glyphosate-resistant (GR). Though we do not have it officially confirmed at this point, I am confident from the last couple years' field observations that Tennessee does have a few fields with glyphosate-resistant ryegrass.
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