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February, 1999

Burndown with FirstRate and Python

by Donald E. Null, Regional Agronomy Specialist
University Outreach and Extension, NW Region

Objective: To determine the ability of FirstRate and Python to provide burndown for no-till soybean production.

Methods: Four tank mixes of Select plus either FirstRate or Python, with and without 2,4-D, were applied seven days early pre-plant on May 5 for burndown and residual weed control in soybeans. These treatments were compared to Select + 2,4-D and to Roundup alone. All treatments, except Roundup, also contained crop oil at 1.2% v/v in a 20 gallons/acre spray solution. Rates applied were as follows:

           Select 2EC, 8 oz/acre              FirstRate 84WP, 0.6 oz/acre
           Python 80WG, 1.25 oz/acre          2,4-D ester 4EC, 1 pint/acre
           Roundup Ultra, 2 pt/acre

Weeds present at the time of application were 1/4 to 1" giant foxtail (heavy pressure) and 1-4" marestail (moderate pressure).

Results: Ratings were taken seven days following the initial herbicide applications. All Select plus FirstRate or Python treatments were providing slower burn-down than Roundup. Two weeks after the applications were made all treatments were providing in excess of 90% control of giant foxtail and marestail. FirstRate and Python were providing marestail control with or without the addition of 2,4-D.

Final ratings were taken June 10 and the results can be seen in the table below. The LSD indicates that there was considerable variation in the treatments. The data suggest that FirstRate provided a higher level of residual giant foxtail control than Python.

Interestingly, the herbicide treatments containing 2,4-D were tending to provide a higher level of common waterhemp control than those not containing 2,4-D. Even though the amount of control was not commercially acceptable, it was statistically significant. The data suggest that the 2,4-D was providing some soil residual for control of waterhemp.

Treatment                                       Percent Control
                                     Giant foxtail           Waterhemp
FirstRate + Select                        91                     10

FirstRate + Select + 2,4-D                87                     66

Python + Select                           64                      0

Python + Select + 2,4-D                   78                     65

Select + 2,4-D                            74                     55

Roundup Ultra                             51                     20

        LSD 0.05                          20                     32

Table 9: Study 4007 


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