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is increasing in both frequency and density in Saskatchewan alfalfa (Medicago sativa L.) seed fields.Application of preharvest glyphosate is an effective means of controlling Canada thistle in annual crops. Whenever possible, control should be done before plants are flowering to prevent seed production. Pursuit may be used on established alfalfa-grass mixtures. Weeds have a large effect on forage quality. I need to treat about 15 - 20 acres and I'm wondering if there are other options besides spot spraying each plant/small area. Monitor pastures, areas used by livestock, and roadsides for new populations of milk thistle in May, June and July. Weed Control in Hay & Pasture Fields Mark Landefeld OSU Extension Educator . SELECTIVE CONTROL IN ESTABLISHED TREE CROPS-- Applications of glyphosate ROUNDUP 1 1/2 qt per acre directed underneath foliage and green bark of established trees and over Canada thistle 10 to 18 inches tall should be made in late spring or on fall regrowth. Its scientific name is Salsola tragus, but it also has been known as Salsola iberica, Salsola kali, and Salsola australis. MUSK THISTLE CONTROL INTRODUCTION Musk thistle is an introduced invasive broadleaf weed native to Europe, Siberia, Asia Minor and North Af- ... building sites, vacant lots, range and pastureland, alfalfa fields and in wheat fallow. It can be a profitable crop to grow, but presents a number of challenges, one of which is the control of kochia (Kochia scoparia), which is not effectively controlled with herbicides currently registered for use on seed alfalfa. February 12, 2015 Canada Thistle Biocontrol Agent Can be Collected in Alfalfa. It is nearly impossible to control weeds in a thin or weak alfalfa stand. Mowing can be a helpful means of Russian thistle control if done just as the plant blooms. Seedlings may emerge Consequently, management practices need to be implemented prior to flower formation for effective thistle control. •Control weeds that emerge in fall or late winter before alfalfa greens up in the spring •Control weeds that emerge after cutting or in areas where the alfalfa stand is thin Flixweed (Descurainia sophia), an annual mustard, infestation in alfalfa. Controlling common pokeweed. Canada thistle is one of the most troublesome and difficult weed species to control in established alfalfa grown for seed production. Taking time to manage any perennial weeds prior to alfalfa establishment will help prevent reseeding costs or excessive weed control costs in the future. When a field is cleared and otherwise prepared for planting, it usually presents an ideal environment for weed Weeds affect alfalfa during two distinct periods: stand estab­ unsatisfactory Canada thistle control (29 to 35%). If a Canada thistle infestation exists in a field that will be rotated to alfalfa, control the weed before seeding alfalfa. Canadian Thistle Control Options in Hay Land. Bentazon was the only treatment containing a single herbicide that provided more than 50% Canada thistle control. Apply Raptor at 4 to 6 fl oz/A plus adjuvants to small, actively growing weeds and to established alfalfa in the fall or in the spring. Perhaps one of the most noxious weeds in the home garden, Canada thistle (Cirsium arvense) has a reputation for being impossible to get rid of.We won’t lie to you, Canada thistle control is difficult and requires a significant amount of effort to be successful, but the effort you put into controlling Canada thistle will pay off when you have a garden that is free from this annoying weed. Another way these crops (winter wheat, alfalfa, and perennial forage) help control CT is that they emerge and grow earlier in the season than CT; by the time this weed emerges, it is shaded and out-competed by the crop. Musk thistle is primarily a biennial or winter annual, relying on seed to reproduce. Alfalfa growth and management also prevents Canada thistle from producing carbohydrates for survival across time; thus, alfalfa is an alternative to tillage for Canada thistle control. Alfalfa, brome or alfalfa/brome mixtures are able to supply good competition to help control Canada thistle, and continual top growth removal weakens root reserves. Asked September 3, 2014, 9:28 PM EDT. The treatments providing the best balance between Canada thistle control (>80%) and alfalfa injury (<13%) were a single ap- Controlling hemp dogbane. Mesbah, AO, Miller, SD (2005) Canada thistle (Cirsium arvense) control in established alfalfa (Medicago sativa) grown for seed production. Musk thistle is not a serious weed problem in crops requiring a spring seedbed preparation. Plant weed-free seed to help prevent introduction into cropland, and keep field borders thistle-free. alfalfa seed yield. Completely out of control, no matter how much pulling I do. Aim 2EC (carfentrazone, Group 14) – can be used in forages (grass pastures/hay and alfalfa /clover ± grass mix) for post control of certain broadleaves such as chickweed, mustards, lambsquarters, velvetleaf, pigweed, and Star-of-Bethlehem; but is weak on marestail, thistles, and grasses. Establishment of a vigorous alfalfa stand is essential for long­term weed control. and will outcompete seedling alfalfa if the field is planted prior to their control. thistle control in various cropping systems, no data are available on losses in improved pastures. The Manitoba Forage Seed Association (MFSA) is running herbicide trials with the hopes of providing producers more options for weed control. 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