Project Details:

Title:
Investigating Dicamba and 2,4-D Herbicide Off-Target Movement

Parent Project: Investigating dicamba movement and injury to soybean
Checkoff Organization:Missouri Soybean Merchandising Council
Categories:Weed control
Organization Project Code:407-20
Project Year:2020
Lead Principal Investigator:Kevin Bradley (University of Missouri)
Co-Principal Investigators:
Mandy Bish (University of Missouri)
Keywords: herbicide injury, Weed Control

Contributing Organizations

Funding Institutions

Information and Results

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Project Summary

The research is to further study dicamba off-target movement and begin studing 2,4-D in the air.

Project Objectives

The primary objectives of this research are to 1) determine the effects of time of application, weather conditions and new formulations on the concentration of dicamba detected in the air following application, and 2) assess weather and environmental factors surrounding dicamba applications in order to identify any consistencies that may explain off-site dicamba movement.

Project Deliverables

Repeating the soil pH studies in the field, adding greenhouse studies to provide further support to the finding, and test other factors that were pulled out of the environment and weather comparisons between on- and off-target applications. Such studies will provide knowledge about what types of applications are most likely to be successful. Results will be presented at field days, extension events and at technical meetings.

Progress of Work

Updated April 27, 2021:
The primary objectives of this research are to determine the effects of time of application, weather conditions and new formulations on the concentration of dicamba detected in the air following application. Also, a primary goal is to assess weather and environmental factors surrounding dicamba applications in order to identify any consistencies that may explain off-site dicamba movement.

Off-target movement is typically grouped into one of three categories:
a) tank contamination or improper cleaning of equipment
b) physical drift, which is caused by factors that contribute to droplets being moved by wind at the time of application
c) secondary drift, which is caused by factors that result in the herbicide moving some time after the application. The factors that contribute to secondary drift are not well understood.

The objectives of this study, which began in 2017, have focused on understanding factors that affect secondary
drift, mostly as they pertain to dicamba movement. Starting in 2019 both dicamba and 2,4-D were evaluated.

Final Project Results

Updated December 9, 2019:

View uploaded report PDF file

Benefit to Soybean Farmers

Research results from this project will provide Missouri soybean producers and agriculture professionals with timely knowledge on dicamba and 2,4-D applications by providing additional information on what is likely to result in a successful application versus an application that is likely to move off target.

Performance Metrics

Project Years