Here is your latest issue of AgFax Weed Solutions, sponsored by Nufarm's Midwestern and Southern field teams.
 
Web Editor: Ernst Undesser

IN THIS ISSUE

Editor's Picks

  • Dicamba Movement And The Effects Of pH — Both In And Out Of The Tank

  • Sprayer Maintenance: 4-Step Winterizing Pays Off in the Spring
  • Dicamba: With Label Decision, Are States’ Options Fading? – DTN
  • Combine Cleaning: Removing Resistant Weed Seeds (Among Other Things)

Focus On The Corn Belt

  • North Dakota: Palmer Pigweed Spreads to More Counties - How Come?
  • Pennsylvania: Perrenial Control - Late-Year Strategies
  • Minnesota: Reduce Your Chances for Volunteer Corn Next Season
  • Nebraska: Atrazine Resistance in Waterhemp – Researchers Investigate
  • Minnesota: Palmer Pigweed – Detection, Reporting – Timeliness Is Key
  • Midwest: Herbicide Resistance and Weed Management – New Online Course
  • Ohio And Illinois: Expanded Look At New Dicamba Regs, Plus 5 Tips

Focus On The South

  • Tennessee: Dicamba Reg Changes In Cotton - Will It Matter? Podcast
  • Texas Cotton: Figuring Out Herbicidal Stalk Destruction With New Seed Technologies
  • Mississippi: Resistant Italian Ryegrass – What You Need to Know – Podcast
  • Tennessee: Deja Vu - Resistant Grass Worse In Cotton, Soy – Podcast
  • Texas: Killing Cotton Around Gin Yards As More Boll Weevils Materialize
 
The pH of both soil and the spray tank solution can have varying effects on whether dicamba volatizes and moves off target. Plenty of questions remain and pH is far from the only factor. But researchers are pinning down more about its influence.
 
    
 
Rinse it, clean it, drain it, store it -- the basic approach to minimizing sprayer problems when you begin rolling ahead of 2019's planting season. 
 
    
 
In the past, states have been able to pass more restrictive state regs on federal pesticide labels. That practice may no longer be routine, because EPA is worried that the legal language does not actually support it, state pesticide regulators say. So-called "local needs" label additions could face delays.
 
    
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Here's a quick holistic guide to ridding combines of weed seeds, among other things. It's a front-to-rear and top-to-bottom approach that can start in the field when the last of the crop has been harvested. The guide was jointly developed by university personnel from Iowa, Nebraska, South Dakota and Wisconsin.
 
    
 
The way Palmer amaranth reached each county was different, North Dakota State University Extension sugar beet agronomist Tom Peters says. The likely sources were seeds carried by migratory birds, a used combine, an alternative feed source purchased out of state, custom combining and grain cleaned out of railroad cars.
 
    
 
When weather turns cold, don't assume that it's too late to control weeds, especially perennials. In the fall, foliar applied herbicides can be effective in the right conditions.
 
    
 
With 2018 storms and downed plants, expect more volunteer corn. Volunteer corn has the potential to reduce crop yield as well as impact the long-term management of corn rootworm. It can be particularly competitive in soybeans.
 
    
 
Control of most Nebraska populations was not satisfactory when atrazine was solely used as PRE or POST. However, PRE application of atrazine was more effective than POST application. Integrated weed management and diversified herbicide programs with selective soil-applied herbicides can assist growers to achieve better control and reduce issues with herbicide resistance.
 
    
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Boots on the ground -- that's what it will take to pinpoint where this heinous weed is developing -- resourses for identifying Palmer and knowing who to call if you find it.
 
    
 
Much of what you've learned about how to apply dicamba on tolerant crops has mostly changed with this most recent EPA revision. That includes spray timing, the number of allowed applications, who can spray, buffers and just about anything else you've already learned. Here's a breakdown on changes and more details than might have been initially available when the 2019 changes were announced.
 
    
 
How the state further tweaks the label remains to be seen, plus a lawsuit is still hanging out there. It's an evolving situation.
 
    
 
With increased adoption of the dicamba and/or 2,4-D tolerant cotton varieties, chemical selection for cotton stalk destruction is a current topic of discussion. With these newer technologies, some tried-and-true approaches won't work now. And at least one new herbicide may be an option, depending on the seed technology in the field.
 
    
 
Put it on your radar and start scouting. It has a long history of glyphosate resistance in Mississippi, plus resistance to at least one mainline herbicide. Once it's up, options are limited. You have to attack it a little differently - with much depending on when this year's crop was harvested.
 
    
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Among other things, herbicidal antagonism has triggered more grass pressure -- heavy enough to complicate harvest in some fields. For older farmers and their advisors, this looks really familiar, unfortunately.
 
    
 
With over 80% of the Texas cotton in XtendFlex or Enlist varieties in 2018, controlling volunteer cotton in and around the gin yard has become more of a challenge. Specifically, these Auxin tolerant varieties are tolerant to more herbicides than just dicamba and 2,4-D. To deny hosts to boll weevils, rethink how you approach this volunteer cotton.
 
    
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