All weeds are problematic, but some can be worse than others. What are the top weeds soybean growers need to watch for this season? According to the University of Missouri Extension, these five can do the most damage:

• Waterhemp
• Marestail
• Palmer amaranth
• Giant ragweed
• Italian ryegrass

These weeds are notorious for their ability to develop resistance to herbicides and evade herbicide control. To properly manage these weeds, a combination of pre-emergence and post-emergence herbicides is recommended, along with the use of row cultivation, according to Iowa State University weed scientists.

An effective weed control program starts early. For control of stubborn weeds, Syngenta offers:

• BroadAxe® XC herbicide for broad-spectrum, long-lasting residual control applied at preplant or pre-emergence. BroadAxe XC combines multiple modes of action to effectively control waterhemp, Palmer amaranth, foxtails, barnyardgrass and many other weeds.
• Boundary^® 6.5 EC soil-applied herbicide to deliver proven early-season grass and broadleaf weed control, excellent resistance management and rotation flexibility. Containing two modes of action, Boundary 6.5 EC can extend your post-emergence application window up to five weeks after planting, thereby protecting your yields from weeds, keeping your fields cleaner longer.
• Flexstar® GT 3.5 herbicide for a post-emergence, over-the-top application in glyphosate-tolerant soybeans. Flexstar GT 3.5 consists of two leading active ingredients and two different modes of action, providing fast, effective control of more than 50 broadleaf weeds, like waterhemp, Palmer amaranth, giant ragweed and morningglory.

Limiting weed pressure is the key to ensure plants continue to grow strong. Boundary, BroadAxe XC and Flexstar GT 3.5 eliminate weed competition. Offering multiple effective modes of action to control weeds, these brands, when combined with cultural practices such as crop rotation and tillage, help reduce the weed seed soil bank, maximize diversity and fight herbicide resistance.

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