Rates of Armezon Pro for Postemergence Weed Control in Fallow

Kansas Agricultural Experiment Station Research Reports, Aug 2017

A study was initiated near Garden City, KS, in 2016, comparing the weed control of several tank mixes of Armezon in fallow. Control of kochia and Russian thistle generally increased as Armezon Pro (topramezone + dimethenamid) rates increased from 14 to 20 oz/a. Although these herbicides injured the weeds present, smaller weeds will need to be targeted for effective control. The population of kochia was too thick and the size of the weeds was too large to allow enough coverage for this product to work under the conditions of this trial. The level of tissue damage suggests that further testing is needed with smaller weeds in a thinner population.

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Rates of Armezon Pro for Postemergence Weed Control in Fallow

R ates of Armezon Pro for Postemergence Weed Control in Fallow R. Currie 0 P. Geier 0 Recommended Citation 0 Kansas State University , USA Follow this and additional works at; http; //newprairiepress; org/kaesrr - Thi s report is brought to you for free and open access by New Prairie Press. It has been accepted for inclusion in Kansas Agricultural Experiment Station Research Reports by an authorized administrator of New Prairie Press. Copyright 2017 Kansas State University Agricultural Experiment Station and Cooperative Extension Service. Contents of this publication may be freely reproduced for educational purposes. All other rights reserved. Brand names appearing in this publication are for product identification purposes only. K-State Research and Extension is an equal opportunity provider and employer. Rates of Armezon Pro for Postemergence Weed Control in Fallow Abstract A study was initiated near Garden City, KS, in 2016, comparing the weed control of several tank mixes of Armezon in fallow. Control of kochia and Russian thistle generally increased as Armezon Pro (topramezone + dimethenamid) rates increased from 14 to 20 oz/a. Although these herbicides injured the weeds present, smaller weeds will need to be targeted for effective control. The popul ation of kochia was too thick and the size of the weeds was too large to allow enough coverage for this product to work under the conditions of this trial. The le vel of tissue damage suggests that further testing is needed with smaller weeds in a thinner population. Creative Commons License Thi s work is licensed under a Creative Commons Attribution 4.0 License. Thi s Weed Science article is available in Kansas Agricultural Experiment Station Research Reports: http://newprairiepress.org/ kaesrr/vol3/iss5/27 2017 SWREC Agricultural Research Rates of Armezon Pro for Postemergence Weed Control in Fallow R.S. Currie and P.W. Geier Summary A study was initiated near Garden City, KS, in 2016, comparing the weed control of several tank mixes of Armezon in fallow. Control of kochia and Russian thistle generally increased as Armezon Pro (topramezone + dimethenamid) rates increased from 14 to 20 oz/a. Although these herbicides injured the weeds present, smaller weeds will need to be targeted for effective control. The population of kochia was too thick and the size of the weeds was too large to allow enough coverage for this product to work under the conditions of this trial. The level of tissue damage suggests that further testing is needed with smaller weeds in a thinner population. Introduction Field observations have suggested that Armezon Pro might provide excellent burndown and residual control in fallow. It is not known when to apply Armezon Pro, what weeds it will control, and the duration of its residual control. Therefore, it was the objective of this study to establish a dose response relationship for Armezon Pro with a naturally occurring population of kochia and Russian thistle. Experimental Procedures An experiment conducted at the Kansas State University Southwest Research-Extension Center near Garden City, KS, evaluated the efficacy of Armezon Pro rates for postemergence weed control in fallow. All treatments were applied May 16, 2016, when kochia averaged 10 inches tall and 10 plants/square foot and Russian thistle averaged 4 inches in height and 1 plant per square foot. Herbicides were applied using a compressed-CO2 backpack sprayer calibrated to deliver 20 GPA at 3.0 mph and 27 psi. Plots were 10- by 35-feet, and arranged in a randomized complete block with four replications. Soil was a Ulysses silt loam with pH of 8.0, organic matter of 1.4%, and cation exchange capacity of 18.4. Visual weed control was determined on May 23, June 1, and June 14, 2016, which was 7, 16, and 29 days after treatment (DAT). Results and Discussion At 7 and 16 DAT, control of kochia and Russian thistle generally increased as Armezon Pro rates increased from 14 to 20 oz/a. By 29 DAT, no differences occurred between herbicide rates. Although these herbicides injured the weeds present, smaller weeds will need to be targeted for effective control. Although field observations at other locations suggested that this product could work, the kochia was clearly too large and the population was too dense to allow adequate coverage of the kochia and Russian thistle tissue. Based on the observed burning of the tissue, this study should be repeated on smaller weeds at lower populations to allow complete coverage of the tissue. Treatmenta Rate oz/a Armezon Pro 14 POST Atrazine 16 POST COC 1% POST AMS 2% POST Armezon Pro 16 POST Atrazine 16 POST COC 1% POST AMS 2% POST Armezon Pro 18 POST Atrazine 16 POST COC 1% POST AMS 2% POST Armezon Pro 20 POST Atrazine 16 POST COC 1% POST AMS 2% POST Untreated --- --Least significant difference (0.05) a COC is crop oil concentrate, and AMS is ammonium sulfate. 28 30 35 Kansas State University Agricultural Experiment Station and Cooperative Extension Service 5 7 days 16 days 29 days after treatment after treatment after treatment


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R. Currie, P. Geier. Rates of Armezon Pro for Postemergence Weed Control in Fallow, Kansas Agricultural Experiment Station Research Reports, 2017,