420 - Weeds Continue As #1 Grower Production Problem
Weed competition has been rated the most serious threat to sugarbeet production in 20 of the last 25 years in the NDSU/U of MN survey, figure 1.
Losses From Weed Problems Include:
- Reductions in yield
- Reductions in quality
- Increased production costs
- More difficulty defoliating the crop
- Greater difficulty harvesting the crop
- Storage losses increase from weeds in piles
- Weed escapes serve as alternate hosts for sugarbeet diseases and insects
Herbicide Resistant Kochia Control:
Use preemerge Ethofumesate as the foundation for effective weed control. Prices of Ethofumesate (Nortron, Etho SC) have decreased by about 40%. Cost of a 7” band is about $24/A and a 3 qt./acre rate in an 11 inch band is less than $36. Etho SC and Nortron are also very effective on Kochia, Redroot Pigweed and many other weeds.
Effective Kochia Control Steps:
- Thorough preplant tillage
- Use Preemerge Nortron or Etho SC
- Plant problem Kochia fields last
- Use preemerge Roundup or Paraquat
- Always use Upbeet
- Use conventional rates of Progress on 0.25 to 0.50 inch diameter or larger Kochia
- Use effective herbicides in rotational crops
- Roundup, Liberty, Starane, Authority, Flexstar, Reflex, etc.
Cost of Weed Competition Very High:
One healthy surviving pigweed per three feet of row reduced yield by 30% and revenue per acre by $90. A single pigweed per 10 feet of row competing with the beet crop all season can reduce revenue/acre by $10 to $20, figure 2.
Microrate Best Management Practices
- Always include Betanex, Betamix or Progress
- Always use Upbeet
- Always use MSO or a basic blend adjuvant
- Always use Stinger
- Use a grass herbicide as necessary
- Start applications 14-21 days after planting
- Always use 3 applications, 4 if needed
- Add Nortron or Etho SC to maximize control
- Increase rates of Betanex, Betamix or Progress as beet size increases
|Beet Size||Betanex or Betamix Rate||Progress Rate|
|Cotyledon to 4-leaf
|4-leaf and larger
Frost and Herbicide Injury:
- Herbicides applied 12 to 24 hours after a frost caused less sugarbeet injury than when applied the day before a frost.
- Herbicide and frost injury were greater on small sugarbeets.
- These results documented in NDSU/U of MN research by Dexter and Mayo.
Always Read and Follow Pesticide Label Directions:
Ethofumesate Plus Microrate:
Adding 4 oz. of Nortron or Etho SC to the first two microrates increased Kochia and Lambsquarters control by 10 to 15% in 2001 NDSU/U of MN research. Cost is only $1.50/acre in an 11 inch band.
Crop Safety Reminder:
Always remember to reduce post emergence rates if applying them over a preemerge herbicide – See pg. 29 in NDSU Pocket Production Guide.