Clarity, Laudis, Diflexx Duo, Atrazine, and Glyphosate for Efficacy in Corn

Kansas Agricultural Experiment Station Research Reports, Aug 2017

A study was initiated near Garden City, KS, in 2016 comparing the weed control of several herbicide treatments in irrigated corn. Control of quinoa, Russian thistle, and kochia was excellent with all herbicide treatments, and late-season control of common sunflower was 100% with all treatments except for those applied preemergence alone. Most treatments controlled green foxtail 95% or more, except Corvus (isoxaflutole + thiencarbazone) plus atrazine preemergence, or the early postemergence (EPOST) treatments containing Liberty 280 (glufosinate). Liberty 280 severely injured the non- Liberty Link corn in this trial, but all other herbicide-treated corn yielded 21 to 45 bu/a more grain than untreated corn.

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Clarity, Laudis, Diflexx Duo, Atrazine, and Glyphosate for Efficacy in Corn

Clarity, Laudis, Diflex x Duo, Atrazine, and Gly phosate for Efficac y in Corn R . Currie 0 1 Kansas State University 0 1 0 1 P. Geier 0 1 0 Kansas State University , USA 1 Kansas State University Agricultural Experiment Station and Cooperative Extension Service , USA Follow this and additional works at: http://newprairiepress.org/kaesrr Part of the Agronomy and Crop Sciences Commons, and the Weed Science Commons Recommended Citation - This 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. Clarity, Laudis, Diflex x Duo, Atrazine, and Glyphosate for Efficacy in Corn Abstract A study was initiated near Garden City, KS, in 2016 comparing the weed control of several herbicide treatments in irrigated corn. Control of quinoa, Russian thistle, and kochia was excellent with all herbicide treatments, and late-season control of common sunflower was 100% with all treatments except for those applied preemergence alone. Most treatments controlled green foxtail 95% or more, except Corvus (isoxaflutole + thiencarbazone) plus atrazine preemergence, or the early postemergence (EPOST) treatments containing Liberty 280 (glufosinate). Liberty 280 severely injured the non- Liberty Link corn in this trial, but all other herbicide-treated corn yielded 21 to 45 bu/a more grain than untreated corn. Creative Commons License This work is licensed under a Creative Commons Attribution 4.0 License. This Weed Science article is available in Kansas Agricultural Experiment Station Research Reports: http://newprairiepress.org/ kaesrr/vol3/iss5/25 2017 SWREC Agricultural Research Clarity, Laudis, Diflexx Duo, Atrazine, and Glyphosate for Efficacy in Corn Summary A study was initiated near Garden City, KS, in 2016 comparing the weed control of several herbicide treatments in irrigated corn. Control of quinoa, Russian thistle, and kochia was excellent with all herbicide treatments, and late-season control of common sunflower was 100% with all treatments except for those applied preemergence alone. Most treatments controlled green foxtail 95% or more, except Corvus (isoxaflutole + thiencarbazone) plus atrazine preemergence, or the early postemergence (EPOST) treatments containing Liberty 280 (glufosinate). Liberty 280 severely injured the nonLiberty Link corn in this trial, but all other herbicide-treated corn yielded 21 to 45 bu/a more grain than untreated corn. Introduction Various commercial herbicides containing isoxaflutole (Balance Flexx, Corvus), thiencarbazone (Capreno, Corvus), tembotrione (Diflexx Duo, Laudis), and dicamba (Clarity, Diflexx Duo) have shown good results in providing weed control with either preemergence or postemergence applications. The objective of this study was to evaluate these products along with atrazine, glyphosate, Liberty 280, and Halex GT (metolachlor + glyphosate + mesotrione) in a single or sequential program for efficacy in corn. Procedures An experiment conducted at the Kansas State University Southwest Research-Extension Center near Garden City, KS, evaluated the efficacy of preemergence (PRE), early postemergence (EPOST), and sequential (preemergence followed by postemergence) herbicides in corn. All herbicide treatments were applied using a compressed-CO2 backpack sprayer, delivering 20 GPA at 3.0 mph and 27 psi. Application dates and environmental conditions are given in Table 1. Soil was a Ulysses silt loam with pH 8.0, 1.4% organic matter and cation exchange capacity of 18.4. Plot size was 10- by 35-feet. The experiment was a randomized complete block with each treatment replicated four times. Visual weed control was determined on June 3 and July 7, 2016, which was 9 days after early postemergence and 31 days after the postemergence treatments, respectively. Corn yields were determined September 26, 2016, by mechanically harvesting the center two rows of each plot and adjusting grain moisture to 15.5%. Results and Discussion Control of quinoa and Russian thistle was 100% regardless of herbicide treatment or evaluation date (data not shown). Kochia control was 95% or more on June 3 regardless of herbicide treatment and 100% by July 7. Common sunflower control was 100% with all EPOST and sequential treatments on July 7, whereas green foxtail control was 95% or more on July 7, except with Corvus plus atrazine preemergence or the EPOST treatments containing Liberty 280. No visible corn injury was observed with any treatment except those containing Liberty 280. The intent of this study was to plant a corn variety resistant to glufosinate. However, a glufosinate-susceptible variety was mistakenly planted. Therefore, Liberty-containing treatments caused 68 to 70 and 88 to 91% corn injury June 3 and July 7, respectively (data not shown). The high degree of corn injury with the Liberty treatments severely limited corn yield. All other herbicide-treated corn yielded 21 to 45 bu/a more grain than untreated corn. Grain yield bu/a 232 226 234 continued a AMS is ammonium sulfate, and NIS is nonionic surfactant. b PRE is preemergence, POST is postemergence, and EPOST is early postemergence. LSD = Least significant difference.


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R. Currie, P. Geier. Clarity, Laudis, Diflexx Duo, Atrazine, and Glyphosate for Efficacy in Corn, Kansas Agricultural Experiment Station Research Reports, 2017,