Dicamba – Using It This Year? “Must Reads” On pH, Timing, Tank Mixing – AgFax Weed Solutions

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Editor: Owen Taylor
Web Editor: Ernst Undesser
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“As we prepare for another year with the Xtend soybean and cotton system, we thought it would help to briefly summarize some of the most important things we’ve learned about dicamba as a result of the research our outstanding graduate students have conducted over the past several seasons.”
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Resistance management strategies should be implemented beginning with the very first application of a new herbicide. A key factor is plugging in the right modes of action at the right time. These 2 videos give a quick and sturdy overview on best approaches and practices.
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Palmer pigweed/amaranth seedlings can look an awful lot like other plant species, particularly waterhemp and other types of pigweed. But because of the aggressive nature of Palmer, the last thing you want is to misidentify it when it’s still small enough to easily and cheaply kill. Here’s a quick 5-point process for determining whether Palmer is ready to pounce.
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Pre-plant intervals and specific label limitations may throw a major kink into which dicamba formulations you can use and when.
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After an investigation into a Palmer amaranth find in Redwood County, the Minnesota Department of Agriculture determined the weed found its way into a soybean field through cattle manure. The cattle had been fed screenings from contaminated sunflower seed.

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“Some farmers outside of the South still seem a bit too relaxed in their approach to Palmer pigweed control. That could be an expensive oversight. This threat isn’t going to be easily overcome — like we did with marestail, ragweed, and many other weed-resistance problems.”
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With flood, cold, and wet conditions in March/April, many producers are facing a smaller than expected window for making their burndown herbicide applications before planting crops. This makes timely applications even more important to provide for a proper interval before planting.
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“Considering the fluctuation of temperatures we have recently experienced in Arkansas, it is understandable why we are seeing another flush of horseweed after the initial burndown applications. On a side note, this is also the reason that we recommend residuals with the early burndown applications to keep horseweed populations under control until planting.”
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“Marestail has probably the most variable emergence pattern of any annual weed we study, which is the reason that control requires a comprehensive management program. Trying to plan herbicide use based on a guess about whether the major emergence will be in fall, or spring, or early summer won’t work. A management program should be planned on the assumption that all of these can occur.”

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Extension Weed Specialist Amit Jhala talks about spring burndown herbicide applications, particularly dealing with burndown challenges and how to overcome them, as well as herbicide modes of action used for burndowns.
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Letting weeds go prior to planting soybeans gives them plenty of time to grow bigger, meaning they’re also harder to control. That’s especially true with resistant horseweed (marestail). You’ll have limited options once you can come back to the field.
WORTH NOTING:
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From our sponsor…
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