• By Clay Perkins •
Questions continue to be asked on how to best manage junglerice, barnyardgrass and goosegrass in cotton and soybean.
Research earlier this spring looking at grass control after an initial glyphosate + dicamba application showed that if a follow-up glyphosate application was applied seven days later better than 90% junglerice control could be achieve (data below). Goosegrass control responded similarly (data not shown).
Junglerice control was less than 80% with a lone glyphosate application. A sequential application of glyphosate spaced seven days apart was needed to provide adequate control.
In addition, a follow-up application of Liberty + glyphosate provided very good grass control and would be a great fit in an Enlist cropping system.
Finally, this research has shown that we are seeing a clear shift towards increasing glyphosate tolerance in our junglerice, barnyardgrass and goosegrass populations.
Some ask about adding 9 or even 12 ozs/A of a 2 lb. clethodim product. In our research, adding a pint of 2 lb. clethodim greatly helps the control on all three of our most troublesome grass species.
Clay Perkins is a University of Tennessee graduate research assistant. He may be reached at firstname.lastname@example.org.