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

  • “Smart” Sprayer Shows Promise In 2018 Tests – Less Herbicide, Less Movement
  • Dicamba: Midwest States Recommend Added Steps To Prevent Movement
  • California Herbicide Resistance – 6 Questions On How It Compares To South, Midwest
  • Sorting Through “Modes Of Action” When Dealing With Resistance Issues
  • Australians Make Bigger Moves Towards Eliminating Weed Seed At Harvest
  • 7 Key Changes In New Dicamba Registration, Plus Drawbacks
  • Cotton: Weed Control In 2019 - Start Thinking Preemerge Combos
  • Dicamba: Despite New Registration, Court Decision Pending
  • Waterhemp: How Is It Slipping Past HPPD-inhibitors In Certain Areas?
  • How Much Does Dicamba Injury Translate Into Yield Loss?
  • California Tree Crop Farmers Facing Italian Ryegrass With Wide Resistance
 
 
The system can significantly reduce herbicide use, depending on weed density, and it could allow for more modes of action to be used in crop. Plus - and this may be even more important - it can reduce the amount of dicamba movement to non-target crops and vegetation.
 
    
 
"The weed science community is pretty unhappy, and doesn’t believe these EPA regulations are really going to help much."
 
    
 
Observations from Dr. Lynn M. Sosnoskie, a weed scientist who was on the frontend of resistance issues in the Southeast and now works in California's San Joaquin Valley. What's the same, what's different, what's known, what's still unclear?
 
    
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Herbicide groups are a relatively new way of determining the site of action of the myriad products on the market. Each site of action has been assigned a number, and most herbicide labels prominently display this group number on the product label. Here's how to interpret all the choices.
 
    
 
By 2014, some form of harvest weed seed collection method already had been implemented on over 40% of Australian’s grain farms “and adoption is expected to increase to 80% by 2020.”
 
    
 
"The label changes...do little to reduce the risk for volatility; experience indicates that volatilization has played a significant role in off-target movement and injury."
 
    
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"Although only a few single active ingredients are labeled for preemergence at-planting applications for cotton, producers have some great tools at their disposal, especially if they consider a tank mixture of two or more residual products...The difference between a weak PREand strong combinations of residual herbicides can drastically change plans for in-season weed management."
 
    
 
"The court’s decision could have repercussions for U.S. farmers, who — operating under the expectation that dicamba applications will remain legal — plan to plant 60 million acres of dicamba-tolerant soybeans and cotton in 2019."
 
    
 
“It’s scary because these waterhemp populations find a way to metabolize these compounds, so it makes chemical weed control that much more difficult.”
 
    
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Several variables matter -- when the damage actually occurs, the amount of material that moves and how often it happens. To different degrees, all can influence how big a hit non-dicamba soybeans will sustain, Kansas researchers find.
 
    
 
Starting with paraquat-resistant populations, researchers found resistance to a couple of other herbicides. "Among the remaining herbicides, glufosinate, rimsulfuron and sethoxydim were found to deliver the best postemergence control. Unfortunately, though, other populations of Italian ryegrass have developed resistance to the three herbicides, indicating their effectiveness may be short-lived."
 
    
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