Category Archives: Soybean

Application Time of Day Effects Gramoxone

Author: Garret Montgomery 2 Comments

With planting hopefully right around the corner, many people are thinking about using Gramoxone (paraquat) as a last minute burndown for its effectiveness and lack of replant interval.  Gramoxone is a very good broad spectrum herbicide that is “money” on many winter annual broadleaf weeds and also quite good on poa.  On the main winter annual weed horseweed (marestail) though, control can range from 30 to 90%.  The question is why?  So we conducted research this spring to see if time of day Gramoxone is applied has an effect on horseweed control. Continue reading

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Quick Turn Around Burndown Options in Soybean

Author: Larry Steckel, Extension Weed Specialist 1 Comment

It is raining as I write and the forecast is not optimistic about getting much done in the field this week. As soon as it dries corn planting will take priority along with some early soybean planting. There is no major problem with planting corn right around a burndown application which makes it much easier than in soybean where many of the burndown herbicides have plant back restrictions.  Continue reading

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Controlling Ryegrass Late

Author: Larry Steckel, Extension Weed Specialist Comments Off

Ryegrass questions have become much more prevalent this week.  I have had no good answers for the calls on how to control ryegrass that escaped the glyphosate burndown in emerged corn.  Herbicides like Accent or Steadfast will not control ryegrass. Liberty tankmixed with atrazine on LL corn would burn the ryegrass back some and is the only even fair option that is available. Continue reading

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Common Herbicides Used in Soybean That Could Carryover into Grain Sorghum

Author: Larry Steckel, Extension Weed Specialist Comments Off

I have written a couple of pieces on fomesafen carryover into grain sorghum. I emphasized fomesafen because it is used on almost all soybean acres in Tennessee.  However, I would be remiss if I did not add that some other herbicides commonly used in soybean have lengthy plant backs to grain sorghum as well.  Continue reading

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Weed Control Management in Conventional Soybean

Author: Larry Steckel, Extension Weed Specialist Comments Off

There have been a number of calls this spring on weed control in conventional soybean.  This is not new as calls on weed control in conventional soybeans have been more frequent the last two years.  Typically the weed spectrum that is the main issue with these calls is not Palmer amaranth but cocklebur and sicklepod.  Continue reading

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