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Showing posts with the label glyphosate

Check Dicamba Soybeans After Spraying

Farmers are turning to an old technology this year to control weeds in their fields. Here’s what they can expect from a new, old-product.

Dicamba has been around for about half-a-century. It is a corn herbicide, but soybeans have been modified to tolerate it. This was done because so many weeds have modified themselves to resist being killed by glyphosate, commonly known as Round-Up. The primary problem, says University of Illinois Extension Weed Scientist Aaron Hager, is waterhemp, “it, has never been excellent on any of the pigweed species. It can be good. It can be very good, but it is not excellent. It is not as consistent.”

This inconsistency makes the timing of dicamba applications extremely important. Without a doubt, says Hager, most post applied herbicides are going to do a better job of controlling a full suite of weeds in a field when the weeds are less than three to four inches in size, “Certainly, with something like dicamba and waterhemp, our recommendation to farmers is to treat very, very small weeds, but to go back in about 10 to 14 days and to scout those treated fields. Look to see what the efficacy has been. Sometimes we can twist up these pigweed plants, but that doesn’t mean they will necessarily be completely controlled.”

Look to see what the efficacy has been. Sometimes we can twist up these pigweed plants, but that doesn’t mean they will necessarily be completely controlled.

It is possible for the weeds to recover, flower, and produce seed. And that, says Aaron Hager, is something to avoid.

Marestail Control Prior to Planting

link to article online

Farmers in Illinois, other states too, are struggling to control glyphosate resistant weeds. Marestail can be one of the most challenging under no-till conditions prior to planting soybeans. More often than not farmers are using a tank mix of glyphosate and 2,4-D (two-four-dee). Sometimes the problem is that the weed is already too big to control, at others says University of Illinois Extension Weed Scientist Aaron Hager is its just that the 2,4-D isn’t doing the job any better than the glyphosate.

Quote Summary - Well, there are some alternatives that can be used for control of mares tail in a burn down scenario. A product called Sharpen could be included with glyphosate/2,4-D to try to increase the efficacy on the marestail and if that is the case be sure to include a methylated seed oil with any application that has Sharpen with it. Or alternatively you could switch completely over to something like a glufosinate product, like a Liberty or Interline containing product or something like Gramoxone. Either of those will typically perform better when used in combination with metribuzin and probably 2,4-D in the tank as well.

Tillage is another option, however, Hager says to delay it until field conditions are suitable and be sure to till deep enough to completely uproot all existing vegetation.