Category Archives: Weeds

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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Reminder: UT Cotton Scout School, May 29th

Author: Scott Stewart, IPM Extension Specialist No Comments

The annual UT Cotton Scout School will be held on Friday, May 29th at the West Tennessee Research and Education Center (605 Airways Blvd, Jackson). Registration will begin at 8:00 AM with the official program starting at 8:30. It will end with a lunch, but those interested can attend a short  ‘go to the field’ session after lunch. We hope to increase the hands-on portion of the program this year. Topics will include crop development, insect and weed identification, scouting techniques, and more. No registration fee or preregistration is required.

 

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Grass Weed Control Options When PREs Fail in Grain Sorghum

Author: Larry Steckel, Extension Weed Specialist No Comments

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 No Comments

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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Destroying a Poor Stand of Corn and Replanting Back to Corn

Author: Larry Steckel, Extension Weed Specialist Comments Off

There has been little corn planted to this point. Judging by the phone calls today some of that early planted corn will need to be replanted due to all the wet and cold weather. The question arises how to control the old corn stand and plant back to corn quickly. 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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