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Bruce Burdick
1109 S. Birch St.
Albany, MO 64402
660-726-5610
Email:
BurdickB@missouri.edu
Hundley-Whaley Center phone
660-726-3698
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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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