Category Archives: Sorghum

Fomesafen Carryover

Author: Larry Steckel, Extension Weed Specialist No Comments

As expected carryover injury from fomesafen (Flexstar, Prefix, Reflex, Intimidator, Marvel, Dawn, Rhythm, etc.) is starting to show in some fields.  The reason it is showing now is due to all the rain allowing any herbicide carryover to more completely get into the soil solution. Continue reading

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Steps for Managing Insects in Grain Sorghum

Author: Scott Stewart, IPM Extension Specialist No Comments

With a substantial increase in sorghum acres, there are a lot of questions about managing insect pests. Sorghum will typically require more insect management then corn, especially in the Bt corn era. This means we are more likely to need one or more foliar insecticide applications. Below are some steps you should be thinking about for managing insects in grain sorghum. Continue reading

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Grass Weed Control Options When PREs Fail in Grain Sorghum

Author: Larry Steckel, Extension Weed Specialist Comments Off

Over the last several years activation of PRE applied herbicides with timely rainfall has been more the rule than the exception in Tennessee.  That is not the case for most of the state this year. The most common call in this regard the last several days have been on grain sorghum fields where the crop and the weeds have emerged together due to lack of an activating rain on the PRE applied herbicides. Continue reading

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Management of Palmer Amaranth in Non-Activated PRE Herbicide Situations

Author: Larry Steckel, Extension Weed Specialist Comments Off

As anticipated the dry conditions that we experienced last week and that continue through today are not activating pre applied herbicides.  Reports of Palmer amaranth already 1 to 2” tall with emerging crops appears to be common.  How to proceed from here on weed management depends upon the crop as well as the herbicide tolerant trait in the crop. Continue reading

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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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