Agronomy Talk

Weed Management Brief: Carrier Rate - Liberty

Published on Thursday, October 15, 2020

ABSTRACT:

  1. Coverage is king; Liberty® must be sprayed at 20 GPA to achieve maximum control.

  2. Broader spectrum weed control is achieved at 20 GPA vs. lower GPA

  3. Increasing GPA, even by five gallons, can help control weeds like waterhemp and fall panicum.

 

WHY IS COVERAGE IMPORTANT?

Contact products like Liberty® require thorough coverage due to a lack of herbicide movement in the plant. This means that the herbicide must come in contact with the plant tissue in order to achieve control. Systemic products such as glyphosate can translocate throughout the plant, making coverage not as crucial.

WHAT’S FIVE GALLONS OF WATER WORTH?

In a Beck’s PFR study, going from 10 gallons to 15 gallons of water increased waterhemp control by 8% and fall panicum control by 18% 28 days after treatment (DAT). Even better, moving to 20 GPA increased waterhemp control by 20% and fall panicum control by 23%. To achieve maximum control, Liberty applications must be made at 20 GPA and with the correct nozzles. Just like carrier rate, nozzle selection will impact spray coverage. It’s also important to target weeds when they are less than 4 in. to achieve effective fall panicum control. Completing these steps will help maximize your investment. 

CONCLUSION

15 GPA was not enough to showcase the effectiveness of Liberty and resulted in many escapes. If the correct GPA is not used, problematic weeds such as waterhemp and fall panicum will survive. Running 20 GPA provided greater and broader control when using Liberty. 

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Author: Joe Bolte

Categories: Agronomy, Agronomy Talk

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