Weed Watch: Giant Ragweed


Giant Ragweed

Giant ragweed is a fierce competitor — as one of the tallest annual weeds, it is extremely competitive for light and very difficult to control in many broadleaf crops. Complicated further by its emergence throughout the growing season and tolerance to many management tactics, it's important to control this weed before it controls your fields.1,2,3


Giant ragweed is native to North America and commonly found throughout the United States.4,5,6


Just one plant per 110 square feet reduced soybean yields by 50% 2

Keys to Managing Giant Ragweed1, 3, 4

  1. Rotate crops

    to diversify herbicide programs and weed control strategies.

  2. Start clean

    with a burndown herbicide or tillage.

  3. Apply a pre-emergence residual application,

    using a residual product within 2 weeks before planting or prior to crop emergence.

  4. Apply a postemergence application to target small weeds early,

    before weeds grow taller than 4 inches.

  5. Prevent Seed Production.

    If weeds escape, use tillage or physically remove them before plants produce seed.

A Closer Look At Postemergence Application

The key to controlling giant ragweed is all about the right timing and the right products. Apply a postemergence herbicide 20-30 days after planting, when giant ragweed is less than 4 inches tall and easier to control. Choose the right products with the right modes of action to give your crops the best defense against weeds:

XtendiMax herbicide with VaporGrip® Technology 
  • XtendiMax® herbicide with VaporGrip® Technology, a restricted use pesticide, gives you up to 14 days of soil activity on certain small-seeded broadleaf weeds and is an effective tool to control emerged giant ragweed*
Warrantyv Herbicide 
  • Warranty® Herbicide provides excellent levels of residual control on small-seeded broadleaf and grass weeds
Roundup PowerMAX® 
  • Roundup PowerMAX® herbicide controls emerged broadleaf weeds and grasses

With the right postemergence application, as part of a complete strategy, you can keep better control of weeds and help protect your crops to canopy.

Choose the System That Means Results

Choose the system that gives you advanced weed control and yield potential.

See System Overview