Here is your latest issue of AgFax Weed Solutions, sponsored by Nufarm's Midwestern and Southern field teams.
Editor: Owen Taylor
Web Editor: Ernst Undesser
Marketed through 3,000 Case/New Holland dealers in Europe, it's a pricey technology. But the system promises deadly performance with a mode of action that weeds here have yet to experience.
"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."
"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."
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.
Plenty of questions arise about whether the window is still open in a state with its own set of restrictions. Here’s a quick overview as we head into May.
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.
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.
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.
Pre-plant intervals and specific label limitations may throw a major kink into which dicamba formulations you can use and when.
“Weedy rice may have evolved a go-it-alone ‘cheater’ root growth strategy that could allow it to exploit the nutrient-sharing soil environment of rice fields."
As storms pile up across the Midwest and South, how do you prioritize your time among 3 key tasks – planting, nitrogen applications and weed control? It’s a balancing act in a season where standard approaches won’t apply. With weeds: “Make sure you have enough product on hand, if you have to increase rates to take down bigger weeds if weed growth becomes excessive.”
The fall of 2018 is one many growers want to forget. With two hurricanes and other seemingly endless rainfall events, a considerable amount of cotton in South Carolina and Georgia, and to a lesser extent in southeastern North Carolina, was never harvested. That raises questions on the potential for volunteer cotton plants to come up in 2019.
With the increase in glyphosate-resistant marestail across the state, it is increasingly important to tank-mix herbicides to broaden the spectrum of activity for successful control, plus use multiple modes of action.
Remember that the volunteer peanuts that emerge from seeds that made it through the winter and rains are some super tough plants.
"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."
Typical spring no-till burndowns of glyphosate plus 2,4-D will only have marginal and variable control of wild garlic.  Here's what to add.
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.
"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."
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.
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