All posts by Larry Steckel, Extension Weed Specialist

Ryegrass and Poa Management in Corn

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Ryegrass escaping glyphosate plus dicamba burndown

Clearly this year,  many are having trouble managing ryegrass and poa.  Questions began months ago and continue today and have ranged from tactics to burn them down before planting to how to control them in a standing corn crop. What has become abundantly clear is that glyphosate is no longer an effective burn down option for either species across much of the state. Continue reading


Does adding glyphosate to low-volatile dicamba formulations increase volatility?

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All week we have discussed UTIA’s latest research on low-volatile dicamba formulations.  We will end this series of blog posts with one of the first questions asked by TN soybean producers: Does adding glyphosate to low-volatile dicamba formulations increase its chances of moving outside the treated field via volatility? Continue reading


Effect of pH Modifiers on pH of Dicamba+Roundup PM Mixtures

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Tennessee soybean growers asked my colleague, Dr. Tom Mueller, and me to vet some of the directions on the XtendiMax and Engenia labels.  In this third post we examine the ability of three pH modifiers approved on the Engenia label to raise spray tank pH. Continue reading


AMS or Glyphosate Mixed with the Low-Volatile Dicamba Formulations – Which One Lowers Spray Tank pH the Most?

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This is the second in a series of blogs on research that Dr. Tom Mueller and I did to examine some of the directions on the XtendiMax and Engenia labels. In the second test, we examined the effect on spray solution pH when AMS was added to Engenia or XtendiMax, with or without glyphosate. Continue reading


Effect on Tank-Mixture pH when Glyphosate is Added to Either XtendiMax or Engenia

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With the off-target dicamba movement in recent years, Tennessee soybean growers asked my colleague, Dr. Tom Mueller, and me to vet some of the directions on the XtendiMax and Engenia labels.  The goal was to come up with information to help mitigate off-target dicamba. In a series of blog posts this week, we will share our most current findings. Continue reading


Destroying a Poor Stand of Corn and Replanting Back to Corn

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There was very little early corn planted this spring.  The corn that was planted has been subjected to significant cold and wet conditions which increase the probability that some of it may need to be replanted. Hopefully no one will need this information, but if so there are several options to control a thin corn stand and replant back to corn. Continue reading


Late Burndown in Corn

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Sprayers are rolling across Tennessee. Most are trying to catch up as we are well behind the burndown pace of many Tennessee springs. Typically by late March we have a good bit of corn ground burned down and often have a few acres planted. The current 10 day forecast calls for a good chance of rain just 2 days out of those 10.  Regardless of whether the forecast is accurate or not, corn burndown and planting will have to occur fairly close together. Continue reading


Starting this Fall Paraquat Training will be Required for all Paraquat-Containing Products

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The EPA will be requiring that anyone who purchases, mixes or applies a paraquat containing herbicide to take the “How to Safely Use and Handle Paraquat-Containing Products” online training module. Continue reading