Section 5: Herbaceous Weed Control on Prairies and Grasslands

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Field trials indicate that the following weeds will be controlled at herbicide rates indicated below. For best results, most weeds should be treated when they are actively growing and under conditions favorable for growth.

Use a higher rate in the rate range when growing conditions are less than favorable or when weed foliage is tall and dense. Milestone® specialty herbicide also provides preemergence control of germinating seeds or seedlings of susceptible weeds following application. Some weed species, such as Canada thistle and biennial thistles, can be effectively controlled with fall applications.


Accurate application timing, careful measurement of herbicide and a uniform application pattern are essential to economical and effective herbicide treatments. The amount of herbicide to add to your sprayer depends on your spray volume and application rate. Consistent, uniform application can help ensure good coverage of troublesome weeds and avoid excessive rates that could injure desirable species.

Read simple step-by-step instructions on how to calibrate your backpack, handgun, or boomless-nozzle sprayers, and learn important tips for mixing, loading, and applying herbicides at: