ISSUE #438

438 - Tips for Maximizing Weed Control

5-14-03

American Crystal Sugar Company growers spent over $30 million on herbicides in 2002. Nearly 4 applications of herbicide were applied to each field producing sugarbeets. Extensive research by Dr. Alan Dexter and experience of shareholders and agriculturists gained while applying microrates on millions of beet acres since 1998 have led to these best management practices using microrates. Careful review of the information presented here should make it possible to maximize weed control in 2003.

Microrates Use Suggestion:

  • The recommended band width is 11 inches.
  • Keep banders centered over the row using caution or wind shields in windy conditions.
  • Application intervals are usually 5 to 7 days under normal conditions.
  • Return to conventional rates for resistant Kochia or large weeds.
  • Consider increased Stinger rates on Wild Buckwheat, Smartweeds, Lanceleaf Sage and Lambsquarter - NOTE injury may increase slightly.
  • Four microrates usually give better weed control and less injury than three conventional rate applications.
  • Herbicides applied the day after a frost cause less injury than applied the day before a frost.
  • Switch from Betamix or Progress to Betanex when pigweeds are the main weed problem.
  • Control spring seeded wheat or barley cover crop by the time beets have 4 leaves and cover crops have 4 to 5 leaves.

Time required between herbicide application and rainfall to maximize herbicide activity.

HerbicideTime
Betamix, Betanex, Progress 6 hours 
UpBeet  6 hours 
Stinger  6 hours 
Select / Prism  1 hour 
Poast  1 hour 
Assure II  1 hour 

Layby Herbicides In 2003:

Outlook, Dual and Treflan are all registered for use as layby herbicides. Each product has advantages and disadvantages. Discuss them with your agriculturist.

If applying Outlook as a layby over PRE or PPI Dual, risk of beet injury will be less if sugarbeets are going into the early 6 leaf stage. This would also be true for layby Dual applied over a PPI or PRE Dual application.

MICRO-RATE USE GUIDE *

Mixing Order Chemical Broadcast Rate 11" Band Rate 
Water Add 100 Gal. to sprayer tank  
2    Basic Blend (*) Adjuvant  Add 1% V/V Do not use without Meth Oil (add last)  
or  or  or 
Ammonia (**)  1 Gal. Per 100 Gal H20 (2% concentration formulation)  
Upbeet (***)  1/8 oz. tank  1/16 oz. 
Nortron  2 oz. to 4 oz.  1 oz. to 2 oz. 
5      Betamix  1/2 pt. - 8 oz.  1/4 pt. - 4 oz. 
or  or  or 
Betanex  1/2 pt. - 8 oz.  1/4 pt. - 4 oz 
or  or  or 
Progress  5.7 oz.  2.9 oz. 
Stinger  1 1/3 fl oz.  2/3 fl oz. 
7        Select  1/8 pt. or 2 oz.  1/16 pt. or 1 oz. 
or  or  or 
Poast  1/3 pt. or 5.4 oz. 1/6 pt. or 2.7 oz. 
or  or  or 
Prism  1/4 pt. or 4 oz.  1/8 pt. or 2 oz. 
or  or  or 
Assure II  1/4 pt. or 4 oz.  1/8 pt. or 2 oz. 
Water  Finish filling the tank. Add ammonia at the appropriate rate if it's being used.  
MSO   Add 1% v/v if MIXING with a Basic Blend. Adjuvant or add 1.5% if using JUST MSO. (A minimum of 1 pint per treated acre MSO is recommended. A maximum of 2 pints per treated acre MSO is recommended.)

438

Watch For Insects

Cutworms have been found in at least two factory districts. Scout fields for them. Tank mix correct insecticides rates with microrates for control.

Quick Reference Microrate Info

Handy quick reference sheets for beet herbicide use are available from your agriculturist. Laminate them and keep them handy when mixing and applying herbicides.

Thanks to Kelly Sharpe, East Grand Forks Agriculturist, for use of some of this valuable microrate guideline information.