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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
Compare Length of Control Provided by Chloracetamides
by Donald E. Null, Regional Agronomy Specialist
University Outreach and Extension, NW Region
Objective: To determine the length of giant foxtail control
provided by various chloracetamide herbicides.
Methods: Seven herbicides were applied to bare soil on June 28.
The herbicides and rates of application in pounds of active
ingredient per acre were as follows:
Mon 58430 @1.53 lbs Dual II Mag @1.3lbs Axiom @0.76 lb
TopNotch @2.0 lbs Frontier @1.05 lbs Surpass@1.2 lbs
Harness @1.53 lbs
Giant foxtail seed was planted with a Tye drill at the rate
of 35-40 seeds per foot on June 28 and then at two week intervals.
The planting was done across the plot area, perpendicular to the
herbicide treatments. Percent control was rated two weeks
following each foxtail planting.
Results: The graph below shows the percent giant foxtail
control at two week intervals following the initial herbicide
application. At two weeks following planting, each of the
chloracetamide herbicides was providing 100% control of all the
giant foxtail that was planted the same day that the herbicides
were applied.
At four weeks after the herbicides were applied,
and two weeks following the second foxtail planting, the giant
foxtail control provided by the treatments started to show some
differences. The best control (85%) was provided by Mon 58430,
an experimental encapsulated acetachlor product from Monsanto.
Dual II Magnum and Axiom provided 53-60% control of this foxtail
planting. The other products fell into a less persistent
category, providing 10-28% control. The LSD 0.05 for this planting
was 17%.
The third foxtail planting and six weeks after treatment
ratings suggested that the top two products for persistence were
Mon 58430 (47% control) and Dual II Magnum (33% control). Axiom
came in third. The rest of the products had dissipated to the
point of little to no control.
There was no control by any product for the fourth giant
foxtail planting.
Figure 2 Study C8NM1816
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