Postemergence Weed Control with Diflexx, Diflexx Duo, Capreno, and Atrazine in Corn Resistant to Glufosinate and Glyphosate

Kansas Agricultural Experiment Station Research Reports, Aug 2017

A study was initiated near Garden City, KS, in 2016, comparing the weed control of several postemergence herbicide treatments in irrigated corn. Control of kochia, Palmer amaranth, and crabgrass was 96% or more effective with all herbicides at 7 days after treatment (DAT). By 62 DAT, control of these three weed species was generally best when glyphosate, atrazine, Diflexx (dicamba) or Clarity (dicamba) were included in the herbicide mixture. Although all herbicide tank mixes increased yield compared to the untreated plots, no tank mix resulted in a superior yield.

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Postemergence Weed Control with Diflexx, Diflexx Duo, Capreno, and Atrazine in Corn Resistant to Glufosinate and Glyphosate

Postemergence Weed Control with Diflex x , Diflex x Duo, Capreno, and Atrazine in Corn Resistant to Glufosinate and Gly phosate R . Currie 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 - Article 32 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. Postemergence Weed Control with Diflex x, Diflex x Duo, Capreno, and Atrazine in Corn Resistant to Glufosinate and Glyphosate Abstract A study was initiated near Garden City, KS, in 2016, comparing the weed control of several postemergence herbicide treatments in irrigated corn. Control of kochia, Palmer amaranth, and crabgrass was 96% or more effective with all herbicides at 7 days after treatment (DAT). By 62 DAT, control of these three weed species was generally best when glyphosate, atrazine, Diflexx (dicamba) or Clarity (dicamba) were included in the herbicide mixture. Although all herbicide tank mixes increased yield compared to the untreated plots, no tank mix resulted in a superior yield. 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/iss5/32 Agricultural Research Summary A study was initiated near Garden City, KS, in 2016, comparing the weed control of several postemergence herbicide treatments in irrigated corn. Control of kochia, Palmer amaranth, and crabgrass was 96% or more effective with all herbicides at 7 days after treatment (DAT). By 62 DAT, control of these three weed species was generally best when glyphosate, atrazine, Diflexx (dicamba) or Clarity (dicamba) were included in the herbicide mixture. Although all herbicide tank mixes increased yield compared to the untreated plots, no tank mix resulted in a superior yield. Introduction Capreno (thiencarbazone + tembotrione), Diflexx, Diflexx Duo (dicamba + tembotrione), and Halex GT (metolachlor + glyphosate + mesotrione) have been shown to provide good weed control. With the advent of glyphosate-resistant weeds, information is needed on how to augment the weed control of these compounds with Liberty 280 (glufosinate). Therefore, it was the objective of this study to compare various tank mixes to measure their impact on weed control in irrigated glufosinate-resistant corn. Experimental Procedures An experiment conducted at the Kansas State University Southwest Research-Extension Center near Garden City, KS, evaluated early postemergence weed control in corn with resistance to glufosinate and glyphosate. The entire plot area was over-seeded with foxtail, crabgrass, and Palmer amaranth, as well as the domestically cultivated sorghum ‘Rox orange,’ quinoa and sunflowers. These serve as proxies for their wild relatives, shattercane, lambsquarters, and wild sunflowers, respectively. All treatments were applied on June 17, 2016, when corn had two true leaves. A tractor-mounted, compressedCO2 sprayer delivering 20 GPA at 3.0 mph and 30 psi was used to apply all treatments. Plots were 10- by 35-feet and arranged in a randomized complete block design with four replications. Soil was a Ulysses silt loam with pH of 8.0, 1.4% organic matter, and cation exchange capacity of 18.4. Weed control was determined visually on June 24 and August 18, 2016, which was 7 and 62 days after treatment (DAT), respectively. Corn yield was determined October 3, 2016, by mechanically harvesting the center two rows of each plot and adjusting grain weights to 15.5% moisture. Results and Discussion All herbicides controlled quinoa 100% regardless of the evaluation date (data not shown). Control of kochia, Palmer amaranth, and crabgrass was 96% or more effective with all herbicides at 7 DAT. By 62 DAT, control of these three weed species was generally best when glyphosate, atrazine, Diflexx, or Clarity were included in the herbicide mixture. Herbicide-treated corn yielded 40 to 66 bu/a more grain than untreated corn, but yields did not differ between any herbicide treatment. Most of these treatments provided excellent weed control. However, glufosinate has no residual grass or broadleaf efficacy, and its control can be extended with the addition of herbicides with residual activity. 0 6 100 98 99


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R. Currie, P. Geier. Postemergence Weed Control with Diflexx, Diflexx Duo, Capreno, and Atrazine in Corn Resistant to Glufosinate and Glyphosate, Kansas Agricultural Experiment Station Research Reports, 2017,