Diflexx Duo Compared to Capreno, Halex GT, Armezon, Outlook, Status, Degree Xtra, and Bicep II Magnum for Weed Control in Irrigated Corn

Kansas Agricultural Experiment Station Research Reports, Aug 2018

Control of kochia, quinoa, and green foxtail was complete with all herbicides at 78 days after treatment (DAT). Palmer amaranth, common sunflower, and crabgrass was 97% at 8 DAT. By 78 DAT, common sunflower control was complete with all herbicides. Crabgrass control at 78 DAT was excellent except when Diflexx Duo (dicamba + tembotrione) at 24 oz/a + atrazine was mixed with glyphosate or Liberty. All herbicide-treated corn yielded 111 to 126 bu/a more grain than the untreated controls. The various additions to the premixes improved weed control to the point that no difference occurred among them for yield.

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Diflexx Duo Compared to Capreno, Halex GT, Armezon, Outlook, Status, Degree Xtra, and Bicep II Magnum for Weed Control in Irrigated Corn

Diflex x Duo Compared to Capreno, Halex GT, Armezon, Outlook , Status, Degree Xtra, and Bicep II Magnum for Weed Control in Irrigated Corn R. S. Currie 0 1 Kansas State University 0 1 0 1 P. W. 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 23 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 2018 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. No endorsement is intended, nor is criticism implied of similar products not mentioned. K-State Research and Extension is an equal opportunity provider and employer. Diflex x Duo Compared to Capreno, Halex GT, Armezon, Outlook, Status, Degree Xtra, and Bicep II Magnum for Weed Control in Irrigated Corn Abstract Control of kochia, quinoa, and green foxtail was complete with all herbicides at 78 days after treatment (DAT). Palmer amaranth, common sunflower, and crabgrass was 97% at 8 DAT. By 78 DAT, common sunflower control was complete with all herbicides. Crabgrass control at 78 DAT was excellent except when Diflexx Duo (dicamba + tembotrione) at 24 oz/a + atrazine was mixed with glyphosate or Liberty. All herbicide-treated corn yielded 111 to 126 bu/a more grain than the untreated controls. The various additions to the premixes improved weed control to the point that no difference occurred among them for 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/vol4/iss8/23 Agricultural Research Summary Control of kochia, quinoa, and green foxtail was complete with all herbicides at 78 days after treatment (DAT). Palmer amaranth, common sunflower, and crabgrass was 97% at 8 DAT. By 78 DAT, common sunflower control was complete with all herbicides. Crabgrass control at 78 DAT was excellent except when Diflexx Duo (dicamba + tembotrione) at 24 oz/a + atrazine was mixed with glyphosate or Liberty. All herbicidetreated corn yielded 111 to 126 bu/a more grain than the untreated controls. The various additions to the premixes improved weed control to the point that no difference occurred among them for yield. Introduction Diflexx Duo is a very competitive herbicide package mix with Capreno, Halex GT (Smetolachlor + atrazine + mesotrione + glyphosate), Armezon (topramezone), Degree Xtra (acetochlor + atrazine), and Bicep II Magnum (S-metolachlor + atrazine). Each of these package mixes has different levels of preemergence and postemergence weed control. Adding other compounds–such as Liberty (glufosinate), Outlook (dimethenamid-P), and Status (dicamba + diflufenzopyr)–can often improve overall weed control. Therefore, it was the objective of this study to compare these compounds alone and with other products to measure their overall weed control. Experimental Procedures An experiment at the Kansas State University Southwest Research-Extension Center near Garden City, KS, evaluated the premix of Diflexx Duo with tank mixtures for postemergence efficacy compared to standards in corn. All herbicides were applied using a tractor-mounted, compressed-CO2 sprayer delivering 20 GPA at 30 psi when corn was 5 to 8 inches tall. Application, environmental, crop, and weed information is shown in Table 1. Plot size was 10 × 35 feet and arranged in a randomized complete block with four replicates. Soil for the experiment was a Beeler silt loam with pH 7.6 and 2.4% organic matter. Visual weed control was evaluated on June 7 and August 16, 2017, which was 8 and 78 DAT, respectively. Corn yields were determined on October 18, 2017 by mechanically harvesting the center two rows of each plot and adjusting grain weights to 15.5% moisture. Results and Discussion Control of kochia, quinoa, and green foxtail was complete with all herbicides evaluated at 8 and 78 DAT (data not shown), and was 97% or more for Palmer amaranth, common sunflower, and crabgrass at 8 DAT (Table 2). By 78 DAT, common sunflower control was complete with all herbicides. On the same date, only Capreno + glyphosate and atrazine controlled Palmer amaranth less than 94%. Crabgrass control at 78 DAT was greatest with any herbicide treatment except when Diflexx Duo at 24 oz/a + atrazine was mixed with glyphosate or Liberty (85 to 86%). All herbicide-treated corn yielded 111 to 126 bu/a more grain than the untreated controls, but no difference occurred among herbicide treatments for yield. Untreated Diflexx Duo Glyphosate Atrazine Ammonium sulfate Diflexx Duo Atrazine Crop oil concentrate Ammonium sulfate Diflexx Duo Glyphosate Atrazine Ammonium sulfate Diflexx Duo Liberty Atrazine Ammonium sulfate Capreno Glyphosate Atrazine Ammonium sulfate Halex GT Atrazine Nonionic surfactant Ammonium sulfate Armezon Outlook Glyphosate Atrazine Ammonium sulfate Armezon Status Glyphosate Atrazine Ammonium sulfate Degree Xtra Diflexx Duo Glyphosate Ammonium sulfate Bicep II Magnum Diflexx Duo Glyphosate Ammonium sulfate LSD (0.05) Rate oz/a --32 32 16 1% 32 16 1% 1% 24 32 16 1% 24 32 16 1% 3.0 32 16 1% 3.6 pt 16 0.25% 1% 0.57 14 32 16 1% 0.57 3.0 32 16 1% 3.0 qt 32 32 1% 1.6 qt 32 32 1% 100 100 100 100 100 100 99 100 100 NS 99 96 94 91 98 98 100 100 100 6 99 98 97 99 99 98 97 100 100 2 100 100 100 100 100 100 100 100 100 NS a DAT = days after herbicide treatment. Weed control determined on June 7 and August 16, 2017. Corn yields determined on October 18, 2017. 97 98 97 98 97 97 98 98 98 NS 91 86 85 93 88 94 88 93 93 7


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R. S. Currie, P. W. Geier. Diflexx Duo Compared to Capreno, Halex GT, Armezon, Outlook, Status, Degree Xtra, and Bicep II Magnum for Weed Control in Irrigated Corn, Kansas Agricultural Experiment Station Research Reports, 2018,