Sunshine following the herbicide application increases the effectiveness of this photosynthetic inhibitor. This is not advised. Glyphosate's application time for optimal control of winter annual weeds is different from its time for optimal control of perennial weeds. You must manage winter annual weeds separately from perennial weeds to achieve good overall weed control. Key Points Winter annual weeds present a challenge in direct seeding, but they can be effectively and inexpensively controlled.
Scout fields for winter annual weeds in the fall.
The best time to control winter annuals is usually late fall. Herbicide selection depends on the weeds present, herbicide costs and the following crop. Prepared by Dr. Linda Hall , Agronomy Unit, Alberta Agriculture, Food and Rural Development. This page is maintained by Marsha Guenette . The user of this information agrees to the terms and conditions in the copyright and disclaimer .