Weed Control with Postemergence Applications of Status, Armezon, Atrazine, Corvus, Verdict, and Roundup PowerMax in Irrigated Corn

Kansas Agricultural Experiment Station Research Reports, Aug 2016

All postemergence herbicides provided greater than 98% control of quinoa, common sunflower, Palmer amaranth, and green foxtail. Crabgrass and Russian thistle were more difficult to control. All postemergence herbicides except Roundup PowerMax (glypho­sate) alone controlled Russian thistle and crabgrass greater than 89%. Diflexx (dicamba) plus Roundup PowerMax was slightly more efficacious on kochia than Status (diflufen­zopyr + dicamba) plus Armezon (topramezone) with atrazine and Roundup Power­Max, and all other herbicides were intermediate for kochia control. Corn yields did not differ between herbicide treatments. However, all herbicides increased grain yields.

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Weed Control with Postemergence Applications of Status, Armezon, Atrazine, Corvus, Verdict, and Roundup PowerMax in Irrigated Corn

Weed Control with Postemergence Applications of Status, Armezon, Atrazine, Cor v us, Verdict, and Roundup PowerMax in Irrigated 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 January 2016 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. Weed Control with Postemergence Applications of Status, Armezon, Atrazine, Corvus, Verdict, and Roundup PowerMax in Irrigated Corn Abstract All postemergence herbicides provided greater than 98% control of quinoa, common sunflower, Palmer amaranth, and green foxtail. Crabgrass and Russian thistle were more difficult to control. All postemergence herbicides except Roundup PowerMax (glyphosate) alone controlled Russian thistle and crabgrass greater than 89%. Diflexx (dicamba) plus Roundup PowerMax was slightly more efficacious on kochia than Status (diflufenzopyr + dicamba) plus Armezon (topramezone) with atrazine and Roundup PowerMax, and all other herbicides were intermediate for kochia control. Corn yields did not differ between herbicide treatments. However, all herbicides increased grain yields. 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/vol2/iss7/21 Agricultural Research capacity of 18.4. Plots were 10 by 35 feet, and arranged as a randomized complete block replicated four times. Weed control was visually determined July 31, 2015, 57 days after postemergence treatment (DAPT). Grain yields were determined by mechanically harvesting the center two rows of each plot on October 10, 2015, and adjusting the weights to 15.5% moisture. Results and Discussion All postemergence herbicides provided 98 to 100% control of quinoa, common sunflower, Palmer amaranth, and green foxtail at 57 DAPT. All postemergence herbicides except Roundup PowerMax alone controlled Russian thistle and crabgrass 89% or more at 57 DAPT. Diflexx plus Roundup PowerMax was slightly more effective on kochia than Status plus Armezon with atrazine and Roundup PowerMax (99 compared 91% control), and all other herbicides were intermediate for kochia control. Corn yields did not differ between herbicide treatments, but all herbicides increased grain yields 200% or more compared to the untreated checks. 57 days after POST application Timing SASKRb KCHSCc CHEQUd HELANe AMAPAf DIGSSg SETVIh __________________________________________________ % visual ___________________________________________________


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R. Currie, P. Geier. Weed Control with Postemergence Applications of Status, Armezon, Atrazine, Corvus, Verdict, and Roundup PowerMax in Irrigated Corn, Kansas Agricultural Experiment Station Research Reports, 2016,