Section 7. Grasses, Revegetation, and Conservation Reserve Program (CRP) Guidelines

Can Milestone® be applied for invasive weed control with grasses planted after treatment?

Milestone can be applied in the spring through fall to control broadleaf weeds prior to grass planting.  Grasses can be seeded as a dormant planting (in the late fall or early winter) in the year of application or grasses can be seeded the following spring.  Grasses should be planted when soil temperatures are low enough to ensure that the seeds do not germinate and emerge for at least 60 days after application to allow for some Milestone® degradation.

When can Milestone be applied post-emergence over newly seeded perennial grass stands to minimize injury?

Over 33 species of warm- and cool-season grasses have been tested for tolerance to Milestone herbicide. Established grass stands have excellent tolerance at the maximum use rates.  On newly seeded grass plantings, applications of Milestone should be made after seeded grasses have an established secondary root system (tillering and adventitious root development). A secondary root system is usually sufficiently developed by 45 to 60 days after emergence, depending on growing conditions.  Most perennial grasses show improved tolerance to post emergence applications at this stage.

Increased injury to grass seedlings may result when Milestone is applied in tank mixes with other herbicides such as 2,4-D.  Consult all labels for products used for guidance on recently seeded grass stands.

How long after treatments with Milestone® do I need to wait before planting forbs?

In summer rainfall areas:  Milestone can be applied in the summer to control broadleaf weeds prior to forb planting.  Forbs can be seeded 90 days after application as a dormant fall planting insuring that the seeds will not germinate and emerge until the following spring.  Forbs can also be planted the following spring after an application the previous July.

In areas with no to very little summer rainfall (Mediterranean climate), forbs can be planted one year after a Milestone treatment.  

What are the guidelines for planting in CRP?

Milestone Label Statement for Crop Rotation

Do not rotate to any crop from rangeland, permanent pasture or CRP acres within one year following treatment.  

Cereals and corn can be planted one year after treatment.  

Most broadleaf crops are more sensitive and can require at least two years between treatment and planting, depending on the crop and environmental conditions.  

Do not plant a broadleaf crop until an adequately sensitive field bioassay shows that the level of aminopyralid present in the soil will not adversely affect that broadleaf crop.


Rotation out of CRP

Wheat:  When Milestone is sprayed in May or June one year, do not plant winter wheat that fall. Spring wheat may be planted the following spring and winter wheat the following fall. With fall applications of Milestone®, do not plant spring wheat the following spring but winter wheat may be planted the next fall.

Corn can be planted the year following a spring/summer treatment. 

Canola may be planted two years after treatment

Alfalfa may be planted three years after treatment or earlier after a positive bioassay.

Soybeans are more sensitive than alfalfa or canola and should not be planted for at least three years and not before a soil bioassay is completed.

For other sensitive crops such as potatoes, lentils and peas, a soil bioassay should be conducted before planting (see label for directions). Depending on environmental conditions, three years after treatment may be adequate for most crops.