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Glyphosate is extremely potent and has the capability of killing a wide variety of grass and weed species. Dicamba is a selective herbicide that is most commonly used in combating broadleaf weed species, post-emergence. Dicamba comes in either a salt formulation or an acid formulation.
Without glyphosate, controlling perennial weeds will be more difficult and will require a more diversified selection of control options. Perennial grasses can be controlled with selective herbicides (described above).
Dicamba is a selective herbicide that kills broadleaf weeds but does not harm grass. In home use, it is used for killing invasive weeds (dandelion, clover, etc.) in the grass. Glyphosate, in comparison, is a non-selective herbicide. This means it kills every type of plant, including grasses.
Group 14 herbicides are contact herbicides and thus require smaller droplets than systemic herbicides like dicamba and glyphosate. Simply put, you will experience poor weed control if you spray Group 14 herbicides through your Xtend soybean spray nozzles.
Farmers have learned how to manage dicamba in corn while minimizing risks associated with off-target injury. Postemergence use in dicamba-resistant soybean presents a much greater challenge due to higher temperatures and more advanced development of adjacent sensitive crops, particularly soybean.
There are three products commonly used to control glyphosate-resistant waterhemp, fomesafen (Flexstar and other generics), acifluorfen (Ultra Blazer and other generics), and lastly lactofen. These herbicides work well but weeds must be at the two to four-inch height for best results.
Fortunately, most dicamba-resistant soybeans are also Roundup Ready and LibertyLink varieties, leaving farmers with glyphosate and glufosinate as potential alternatives. Hager adds that in glyphosate- and PPO-resistant weed populations, glufosinate could be effective.
Dicamba is a selective herbicide in the chlorophenoxy family of chemicals that controls or suppresses only broadleaf plants, but will leave grass weeds and plants alone. This is unlike glyphosate that is nonselective and controls plants regardless of the species.
The logic was that dicamba would eliminate glyphosate-resistant weeds, and glyphosate would wipe out all other unwanted vegetation.
For glyphosate- and ALS-resistant waterhemp, use effective residual herbicides at planting and timely postemergence applications that include effective residuals. In soybean, effective residual products can include S-metolachlor and pyroxasulfone (Group 15), metribuzin (Group 5), and fomesafen, sulfentrazone, and flumioxazin (Group 14).
Dicamba has been effective in controlling glyphosate-resistant broadleaf weeds, but its expanded use has increased the risk of drift damage. Eckel, who is also vice president of the Ohio Soybean Council, said his farm turned to dicamba when it was having heavy marestail and waterhemp issues.
Although the exact mechanism isn't known, dicamba inhibits the plant's metabolism of the glyphosate or clethodim, allowing grassy weeds to survive the application.
Using certified organic vinegar may help ensure your Roundup alternative is free of glyphosate. Some vinegars are made from apple cider, wine and grape juice, such as balsamic vinegar. Typically corn-based vinegar is used to kill weeds, but all vinegar includes acetic acid, which can kill weeds.
Glyphosate, better known as RoundUp, was created by the agrochemical company Monsanto in 1970. Like dicamba, glyphosate’s use was originally fairly limited, as it could only be sprayed in...
A drift-prone herbicide called dicamba continues to plague the Midwest, despite promises to end the problem from the chemical's backers. A top seed industry executive now has joined dicamba's...
It seems dicamba won’t be solving the glyphosate-resistance problem. Researchers have already shown that pigweed, one of the main targets of dicamba, can develop resistance to the herbicide within as few as three years.
Huge amounts of glyphosate (Roundup) sprayed on crops genetically engineered for resistance to it triggered an epidemic of glyphosate-resistant weeds on 120 million acres, just as overused antibiotics breed resistant bacteria. Monsanto sold regulators and farmers on its dicamba system as a means to control these glyphosate-resistant weeds.
Unlike traditional Roundup, which contains glyphosate, Roundup for Lawns contains a combination of selective herbicides, including MCPA, quinclorac, dicamba, and sulfentrazone. These ingredients are chosen for their ability to target broadleaf weeds and grassy weeds without harming most turfgrass species.
Burndown herbicide programs for no till soybeans will include either glyphosate, glufosinate or paraquat tank mixed with 2,4-D and/or Sharpen (saflufenacil). The addition of metribuzin or Valor SX (flumioxazin) or both to the burndown program will provide residual control of marestail.
University of Tennessee weed scientists found adding glyphosate to dicamba formulations increased detectable dicamba air concentrations by 3 to 9 times compared to dicamba alone.