Published on Thursday, October 15, 2020
Glyphosate is effective on many of the same weeds on which Liberty is weaker, like grasses, velvetleaf, etc. Therefore, manage a Liberty + glyphosate application just like Liberty alone, since the Liberty is doing the heavy lifting. AMS, nozzle selection, time of day, and targeting weeds less than 4 in. in height is critical for success. If weeds become too large, grass control will be reduced and the glyphosate application should be made on a separate trip. Concerning the correct carrier rate, Liberty and glyphosate both have different requirements when it comes to spray volume.
In this study, waterhemp control increased as coverage increased in the Liberty + glyphosate applications. With lower spray rates of Liberty alone, we saw a decrease in fall panicum control, but when adding glyphosate, control remained consistent across the various spray rates. This is because glyphosate is systemic and fall panicum control was not impacted by spray volume. Glyphosate has limited efficacy on GR weeds, so effective Liberty control is necessary (20 GPA).
Author: Joe Bolte
Categories: Agronomy, Agronomy Talk