ISSUE #483

483 - Weed Control: The 4th Gold Standard

5-10-06

Crop Losses Due To Weed Competition Range from About $18 to $25 Million Annually

Variety selection, fertility management and stand establishment are critical Gold Standard Agronomy practices that establish crop potential. Achieving optimum cost effective weed control is the next critical crop protection practice to ensure the 2006 crop reaches its potential. Weed control remains the most serious production problem for growers, Figure 1.

483

Cost of Weed Control

Crop losses due to weed competition range from about $18 to $25 million per year. Weed control is the second largest cost of production in Minnesota and North Dakota each year. Weeds reduce yield and quality, increase sugar losses in storage and increase cost of harvest operations in the field and at piling stations. Pigweeds species and kochia were each rated the most difficult to control weeds by 35% of all growers for the last 5 years. Common Lambsquarters was a distant third at 16% followed by Smartweed, Waterhemp and Lanceleaf Sage. Total cost for herbicides, hand labor and custom application cost was $88/A in 2003, $74/A in 2004, and $73/A in 2005. Average cost for rotary hoe and row crop cultivation is from $8-9 per acre.

Maximizing Microrate Effectiveness

  • Use a soil applied herbicide to condition weeds for the kill.
  • Apply PRE Roundup it eliminates all large weed escapes after tillageĀ 
  • Add extra Nortron or Ethotron to MR

    • Four ounces in first three MR works best
    • 12 oz maximum per season

  • Increase Betanex, Betamix or Progress rate with the second, third and 4th MR as necessary
    • For example start with 8 oz Betamix in MR, then use 12 oz, then 16 oz
  • Always include UpBeet
  • Almost always include Stinger
  • Add extra Stinger for tough weeds
    • Increases control of Lambsquarters, Lanceleaf Sage, Thistles, other weeds
  • Use of a quality MSO is highly recommended, a Basic blend adjuvant or a combination of the two may also be used
    • Use 1.5% v.v.
    • Never use less than 1 pint per acre or more than 2 pints/acre
  • Use Z64 adjuvant for large or tough to kill weeds
    • Must have at least 4 leaf beets to use Z64 safely

Micro-rate Mixing Instructions

  1. Fill spray tank 1/3 full with clean water, warmed water is best.
  2. Slurry UpBeet in warm water before adding to tank
  3. Add Basic Blend Adjuvant (Quad 7, Linkage, Newtone, etc.). Only add enough for amount of water in tank at this time.
  4. Add Nortron* at 4 fl oz/acre (optional).
  5. Fill tank 2/3 full of water
  6. Add Betanex*, Betamix*, or Progress*.
  7. Add Outlook or Dual Magnum* (optional if need layby)
  8. Add Stinger*.
  9. Add the grass herbicide, they generally help reduce precipitate.
  10. Fill spray tank with water and the rest of the Basic Blend adjuvant.
  11. When tank is nearly full add the methylated seed oil.
  12. Gentle agitation will result in less precipitate than strong agitation. Spray tank until empty as soon as possible

* or generic equivalent

For More Information on Weed Control

  • Contact your agriculturist
  • Refer to the 2005 Sugarbeet Pocket Guide Pg. 22-51
  • Contact university specialists