Chemical (Herbicide) Control

Jason Norsworthy (University of Arkansas) explains the importance of using multiple herbicide modes of action (2:59).

Diversifying herbicide modes of action

Relying heavily on the same herbicide mode of action from year to year causes unwanted selection of herbicide resistant weed populations. This is because the resistant weeds survive repeated applications of the same herbicide every year, while susceptible weeds die off. By diversifying the number of effective herbicide modes of action in a tank and from one application to the next, the producer is limiting the opportunities for weeds to develop resistance.

Resources:

Increased Dicamba Use Requires Enhanced Stewardship – Iowa State University

Understanding Herbicide Mode of Action – Oklahoma State University

Herbicide Resistance: Rotate Herbicide Modes of Action – Syngenta

Rotate Those Herbicide Modes of Action – Southwest Farm Press

Rotate Crops and Herbicide Modes of Action – WeedSmart.org

Weed Control Guide for Ohio, Indiana, and Illinois – by Mark Loux (OSU), Bill Johnson (Purdue), and Aaron Hager (U of IL)

Early Season Weed Control – Farm Progress

Strategies to Reduce Spray Drift – Kansas State University