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Scientists find time of day makes a difference with some herbicides

In Southeast Farm Press

What if a cotton producer needed to spray early in the morning or late in the afternoon or at night? Does the time of day a herbicide is applied make a difference in how well it works? A group of weed specialists studied this and what they found surprised them.

The group included scientists from the University of Georgia, Louisiana State University, Mississippi State University, North Carolina State University and the University of Tennessee. Continue reading

Growers will need to use care with new herbicides

In Southeast Farm Press

by Roy Roberson

Combinations of popular herbicides like glyphosate, glufosinate, 2,4-D and dicamba will be making their way into the market place in the next few years, and while these new products will be a boon to many farmers, the side effects can likewise be an economic liability if these lethal combinations are not used correctly.

Continue reading

Controlling pigweed means keeping ahead of it

From Southeast Farm Press

It’s a tough fight, but there is no reason for Palmer amaranth to kick a soybean grower’s butt.

Some growers continue to struggle, but soybean farmers now have the tools to win against it. So how can farmers not lose against pigweed? Two Southeast weed specialists have good game plans.

Even though the tail end of harvest for this year is in sight, it’s never too early in Georgia for farmers to get pigweed strategies lined up for next year’s row crops, including soybean. Get a good plan and stick to it as best able, said Eric Prostko, weed specialist with the University of Georgia Cooperative Extension.

“As it has been said before ‘the devil is in the details,’” Prostko said. “In my opinion, there are three details that growers must use if they ever expect to get a handle on Palmer amaranth control.”

No. 1: Start clean. You will lose if you plant soybeans into a stand of Palmer amaranth. Till it, burn it down with herbicides or use rye cover crops, but start Palmer–free.  If there will be a long delay between tillage and planting, use of a residual herbicide to prevent Palmer emergence during that time period.

No. 2: At least one or even two residual herbicides will be needed for the season.  “Sadly, the good old days of just spraying glyphosate or Liberty are over (in Georgia),” he said. “There are many effective residual herbicide choices.”

Authority MTZ, Boundary, Canopy, Dual Magnum, Envive, Tricor, Warrant and Valor all work.  “I would prefer herbicides like Reflex or Prefix be applied postemergence. These are the only over-the-top herbicides that will control small emerged Palmer plants and provide residual activity,” Prostko said.

Even if a farmer uses a LibertyLink soybean system, he still needs a residual herbicide.  But a residual is only good if it can be activated timely with irrigation or rain. If not activated, the soybean farmer will lose against pigweed.

No. 3: Postemergence herbicide application must be made before the biggest pigweed hits 3 inches. If the plants are bigger, well, you know, a farmer will lose against pigweed. Scout fields once a week or more, he said, and do it from outside of the truck.

“My greatest wish is that I never again receive a phone call about how to control 12-inch Palmer amaranth in soybeans.  That is a question for which there is no answer. … Palmer amaranth control does not have to be the major management issue.  I will be the first to admit that it is not easy.”

Read the rest of the story from Southeast Farm Press.

Does Herbicide Use Encourage “Superweeds”?

When Roundup® entered the market in the early 1970s, it seemed to be an herbicide dream come true. Inexpensive, effective and non-persistent in the environment, glyphosate, the main ingredient in Roundup®, gave most users few things to complain about. Roundup® was cheaper than many other herbicides, so farmers could use it throughout the growing season with little economic impact. Farmers also enjoyed weed-free fields, and with the introduction of Roundup Ready crops in the 1990s, spraying weeds in developing fields became easier. National Park Service staff even use glyphosate to kill invasive weeds in the forest because it effectively controls vegetation and has low mammalian toxicity.

Continue reading