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Worst Weeds, Ranked

It’s no secret that weeds are a farmer’s enemy—but which weeds pose the biggest threat? The Weed Science Society of America (WSSA) recently deployed a survey to nearly 200 weed scientist across North America to find out more about weeds in farmers’ fields.

WSSA asked weed scientist to identify the most troublesome weeds as well as the most common weeds in their state. They considered herbicide resistance, frequency and crop affected by the weeds while making their rankings.

When Will the Herbicide Cavalry Arrive?

Seven states and counting as the dominoes fall. PPO herbicide resistance in Palmer amaranth is spreading in the same manner glyphosate resistance advanced a decade ago. (Good luck even finding a Palmer population that’s responsive to glyphosate in some states.) An empty quiver of PPO chemistries (Group 14 herbicides) is no academic footnote; it carries a devastating loss of post-emergence options. Simply, lack of post-emergence weapons can mean adios to soybeans for some growers.

Chasing Waterhemp, the Bell Cow of Weed Resistance

Aaron Hager is standing in a resistant waterhemp hot zone. The soybean rows surrounding him are a blanket of five-way herbicide resistance: atrazine, ALS inhibitors, PPO inhibitors, HPPD inhibitors and 2,4-D. The waterhemp population’s resistance to 2,4-D is telltale. As Hager leafs through pages of farm records, he realizes the central Illinois field is a 2,4-D virgin and has never been sprayed with that particular broadleaf herbicide.

Differentiate Site of Action and Active Ingredient to Manage Weeds

On each herbicide label, companies specify active ingredients and sites of action alike. Note, each herbicide active ingredient falls into a specific site of action and the two are not the same classification and should not be treated as such.

“When you have resistance to one active ingredient you’ll generally have resistance to more than one in that herbicide site of action,” says Dave Johnson, DuPont Crop Protection Agronomist. “But there are some exceptions.”

Robotic Weed Killer Nears Farmland

Artificial intelligence recognizes crop, targets weeds

What if an army of herbicide snipers in a sprayer shot weeds but never hit crops? The same technology enabling facial recognition on Facebook is ready for plant recognition to spray weeds on a dime, all in one pass. Simply, the tractor never stops rolling.

Dicamba: A Guide to Your Label

About two years. That’s all the time you have to prove to the Environmental Protection Agency (EPA) you and your neighbors will follow new dicamba formulation label requirements, or the agency could let its approval expire at the end of 2018. “With the possibility of spraying in June and July on lots of additional acres, remember broadleaf plants are very, very sensitive to dicamba,” says Mandy Bish, senior research specialist at the University of Missouri’s weed science program. “It only takes a small amount to injure nontarget plants.

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