Herbicide Resistance Management Strategies
The Weed Science Society of America (WSSA) defines herbicide resistance as the inherited ability of a plant to survive and reproduce following exposure to a dose of herbicide normally lethal to the wild type (1998). Resistance has been growing exponentially in production agriculture over the last decade and is becoming increasingly important in turfgrass management.
Annual bluegrass is the most common weeds to develop herbicide resistance in golf turf. This picture shows healthy annual bluegrass next to severely injured annual bluegrass after herbicide application. (Envu)
Goosegrass is known to be resistant to a number of herbicide sites of action used in turf. (Envu)
Factors that lead to herbicide resistance • High genetic diversity • High reproductive ability • Limited initial susceptibility to a herbicide
Prudent herbicide use to maximize control and limit resistance • Use appropriate rates and adjuvants to maximize control of individual applications • Apply when weeds are most susceptible, usually younger weeds or annuals prior to emergence • Use tank mixtures of 2-3 herbicides with different sites of action, which is preferred over rotation for limiting resistance • If tankmixing is not practical, then rotate herbicides with different modes of action every 3 to 5 years
• Using herbicides at the lowest or even below label rates • Repeated use of a single herbicide or herbicides with the same sites of action • Cultural practices favoring survival, reproduction, and spread of target weed(s)
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