Download Evaluation of Herbicide formulations on South Texas Mixed Brush

Effectiveness of Surmount on
Black Brush and Mixed Brush
Donnie Montemayor
County Extension
Agent-Ag
Bee County
Result Demonstration: Summary
Five different herbicide treatments were evaluated
on the AD Walker Ranch in Western Bee County
near the Mineral Community. Evaluation in October
of 2005 indicated that the best treatment for the
efficacy of Surmount on Black Brush was Surmount
@ 6 pt./ ac. Prior to the treatment in the fall of 2004 ,
the black brush and mixed species had been
shredded. At the time of the treatment there was
numerous multi-stemmed plants, making foliar
spraying the only logical approach in chemical brush
suppression.
Problem
Beef cattle producers continue to deal with
re-infestation of brush plants in improved
pastures that have been previously cleared.
Many pastures in the Bee County area use
shredding as a form of brush control. The
shredding only makes it more of a challenge
due to maintenance of equipment, fuel and
labor costs.
Objective

To evaluate the effectiveness of 3 different
Surmount rates and two other different
herbicide formulation treatments for the
control of Black Brush and mixed brush
plants.
Typical Bee County Native Pasture
Blackbrush Acacia
Huisache
Honey Mesquite
Materials and Methods
5 herbicide treatments were applied to re-growth
black brush on October 15th, 2004 with soil
conditions considered to be wet. 2 replications were
used. Plot size was .4 ac. The temperature was 73
degrees, with 50% relative humidity. Wind direction
was from the north west. The soil in the treated area
was a sandy loam soil. Equipment used to apply the
herbicide treatments included a tractor /boom
sprayer.
Mixing of Formulations
Spraying of Plots
Materials and Methods cont.
20 gal/ac. of water was used as the carrier, and a .25%
agricultural surfactant was used with no die added.
Treatments:
1.
Surmount@3 pt/ac.
2.
Surmount@4 pt/ac.
3.
Surmount@6 pt/ac.
4.
Tordon 22K @2 pt/ac. + Remedy @ 1pt./ac
5.
Cimarron Max @ rate 3(Cimarron @ 1oz.+
Weedmaster@ 2pt./ac.)
Surmount™ herbicide
Active Ingredient:
picloram + fluroxypyr
Tordon® 22K herbicide
Active Ingredient:
picloram
DuPont™
Cimarron®
Max
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herbicide Active Ingredients By Weight
Metsulfuron Methyl*
Methyl 2-[[[[(4-methoxy-6-methyl
-1,3,5-triazin-2yl)amino]carbonyl]
amino]sulfonyl]benzoate . . . . . . . . . . . . . . . . . . .0.75%
Dimethylamine salt of dicamba
(3,6-dichloro-o-anisic acid)** . . . . . . . . . . . . . .12.25%
Dimethylamine salt of 2,4-dichlorophenoxyacetic
acid*** . . . . . . . . . . . . . . . . . . . .35.25%
Inert Ingredients . . . . . . . . . . . . . . . . . . . . . . . . .51.75%
TOTAL 100.0%
Results
Plot
100% top 50% <50 No kill
w/sprouts kill
% kill
1
No.
100%
Plants Kill
172
48
34
21
45
24
2
178
44
58
33
23
20
3
160
72
52
14
10
12
4
94
40
21
14
15
4
5
140
44
31
21
30
14
Cost of Application
Plot
1
Treatment
Surmount@3 pt./ac
Cost/ac.
$22.50/ac.
2
Surmount@4 pt./ac
$30/ac.
3
Surmount@ 6 pt./ac. $45/ac.
4
Tordon 22K @ 2
pt./ac +
remedy@1pt./ac.
Cimarron Max@
Rate 3
5
$25.50/ac.
$25.00/ac.
Conclusion
The best results in this particular test were seen with
the 3rd treatment using 6 pts. of Surmount.
Moreover, black brush and other south Texas brush
that have been in a management system that
includes shredding, have developed a large root
making complete kill almost impossible after one
application. Thus, additional treatments are required,
which increases the cost of the chemical treatment.
Due to the lack of data on Surmount, more
demonstrations are needed.
Acknowledgements
Appreciation is expressed to
Mr. A.D. Walker for providing
the pasture in conducting
the test. Also appreciation is
expressed to Mr. Rudy
Alaniz, and Mike Hiller for
installing the treatments and
to Dr. Wayne Hanselka for
his support in organizing the
demonstration and
development of the plot
plan.
References
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www.dowagro.com
www.dupont.com
uvalde.tamu.edu