Late spring and early summer applications of Milestone® on Canada thistle should be made after all plants have emerged and basal leaves are expanded. It is better to wait until some of the plants are at the bud growth stage to be sure that all plants are emerged before applying Milestone at 5 to 7 fluid ounces per acre (fl oz/A). Use the 7 fl oz/A rate at later growth stages.
Applications of Milestone at 5 to 7 fluid ounces per acre (fl oz/A) should be delayed until Russian knapweed has bolted and is in the early bud to flower growth stage through the fall. It is important to remember that herbicide efficacy symptoms do not always show on Russian knapweed the season the treatment is made.
Bull thistle (Cirsium vulgare), musk thistle (Carduus nutans), plumeless thistle (Carduus acanthoides)
Milestone at 3 to 5 fluid ounces product per acre (fl oz/A) can be applied in spring and early summer from rosette to early flower growth stage. Use the 5 fluid ounce rate at the late bolt to early flower growth stage.
SPOTTED and DIFFUSE KNAPWEED
(Centaurea stoebe and C. diffusa)
Milestone at 5 to 7 fl oz product per acre may be applied any time during the growing season when plants are actively growing. Applications made during the late bud to bloom stage will not stop seed production the year of treatment.
Birdsfoot trefoil is a perennial broadleaf plant that reproduces by seeds, and spreads laterally by stolons and rhizomes. Milestone® at 5 to 7 fluid ounces per acre (fl oz/A) applied in either June or fall provides good control of the plant and is more effective than Transline® at 1 pint per acre. The lower rate of Milestone (5 fl oz/A) is more effective when applied in fall compared to June. Additional information: http://bit.ly/birdsfoottrefoil
The most cost effective treatment for teasel is the use of selective foliar applied herbicides. Milestone at 4 to 7 fl oz/A provides good to excellent control of teasel. Milestone herbicide should be applied in the spring and early summer to rosettes or bolting plants to stop seed production. The higher application rate of 5 or 7 fl oz/A is recommended for plants at the bolting growth stage.
Additional information: http://bit.ly/teasel2012
(Securigera varia [Coronilla varia])
Crown vetch is a deciduous, perennial forb that reproduces and spreads by both rhizomes and seed. Large infestations of crown vetch are best controlled with an integrated management approach. Milestone at 5 to 7 fl oz/A should be applied to crown vetch at the vegetative growth stage prior to bloom. The higher rate of 7 fl oz/A is recommended at later growth stages. Removal of top growth by pulling, mowing or burning followed by an herbicide application to regrowth may improve control. Follow-up herbicide application may be necessary to control seedlings emerging from the soil seed bank or older plants that survive treatment.
Additional information: bit.ly/crown-vetch
WOODY PLANT CONTROL IN PRAIRIES
Managing invasive plants such as Siberian elm (Ulmus pumila), buckthorn (Rhamnus cathartica), honeysuckle (Lonicera spp.), locust (Robinia spp.), and other woody species is often difficult. Herbicide treatments alone or in combination with fire and mechanical methods, such as cutting and shredding, can provide cost effective removal of woody vegetation. Use of herbicides minimizes site disturbance compared to mechanical methods, and can be applied on a variety of sites often throughout the year.
For detailed information regarding foliar, basal, and cut surface herbicide applications on woody plants go to http://bit.ly/woodyplantcontrol
Other Invasive Plant Species
A complete list of species controlled by Milestone herbicide and application timing specifications is included in Section 4 of the Invasive Plant Management with Milestone and Other Herbicides publication.
®™Trademark of Dow AgroSciences, DuPont or Pioneer and their affiliated companies or respective owners. Milestone is not registered for sale or use in all states. Contact your state pesticide regulatory agency to determine if a product is registered for sale or use in your state. Label precautions apply to forage treated with Milestone and to manure from animals that have consumed treated forage within the last three days. Consult the label for full details. Always read and follow label instructions.
Active ingredients for herbicide products mentioned in this article: Milestone (aminopyralid).