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.
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.”
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.
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.
In the past few years, Palmer amaranth has snuck into Illinois, Indiana, Iowa, Minnesota and Ohio fields in an unexpected way: through CRP and native plantings. To prevent the weed from getting into the professional seed supply, researchers created a DNA test to identify the seed before it reaches the farm.
Research confirms paths of drift mitigation
Bigger isn’t better, but in this case it’s a whole lot safer. As the spray application industry trends to coarser droplets that offer less coverage but mitigate drift, new field data offers valuable insights into the efficacy of spray tips and hoods. The trial results are particularly timely with three new dicamba herbicides available this year: Engenia, FeXapan and XtendiMax.
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