Fallow Weed Control with Preemergence Applications of Balance Pro, Corvus, Banvel, Atrazine, and Authority MTZ

Kansas Agricultural Experiment Station Research Reports, Aug 2016

Atrazine alone applied in the fall was less effective for kochia and Russian thistle control than other fall- or spring-applied herbicides in early summer. In mid season, control of kochia and Russian thistle was 85% or less with all fall-applied herbicides. Banvel (dicamba) increased kochia control when added to Balance Pro (isoxaflutole), plus Autumn Super (iodosulfuron + thiencarbazone), plus atrazine applied in the spring at mid season. All other spring herbicides were similar for kochia control. Russian thistle control was similar among all spring-applied herbicides except atrazine plus Banvel.

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Fallow Weed Control with Preemergence Applications of Balance Pro, Corvus, Banvel, Atrazine, and Authority MTZ

Fallow Weed Control with Preemergence Applications of Balance Pro, Cor v us, Banvel, Atrazine, and Authority MTZ R. Currie P. Geier 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 Currie, R. and Geier, P. (2016) "Fallow Weed Control with Preemergence Applications of Balance Pro, Corvus, Banvel, Atrazine, and Authority MTZ," Kansas Agricultural Experiment Station Research Reports: Vol. 2: Iss. 7. https://doi.org/10.4148/2378-5977.1263 - 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. Fallow Weed Control with Preemergence Applications of Balance Pro, Corvus, Banvel, Atrazine, and Authority MTZ Abstract Atrazine alone applied in the fall was less effective for kochia and Russian thistle control than other fall- or spring-applied herbicides in early summer. In mid season, control of kochia and Russian thistle was 85% or less with all fall-applied herbicides. Banvel (dicamba) increased kochia control when added to Balance Pro (isoxaflutole), plus Autumn Super (iodosulfuron + thiencarbazone), plus atrazine applied in the spring at mid season. All other spring herbicides were similar for kochia control. Russian thistle control was similar among all spring-applied herbicides except atrazine plus Banvel. 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/iss7/18 Agricultural Research Procedures An experiment was conducted at the Kansas State University Southwest ResearchExtension Center near Garden City, KS, to examine the efficacy of fall and spring preemergence herbicides in fallow. The plot area had a dense infestation of kochia in the summer of 2014, which was allowed to naturally reseed. Fall treatments were applied November 20, 2014 and spring applications were made March 9, 2015. All herbicides were applied using a CO -pressurized backpack sprayer delivering 20 gpa at 27 psi and 2 3 mph. Soil was a Ulysses silt loam with 1.4% organic matter, pH of 8.0, and cation exchange capacity of 18.4. Plots were 10 by 35 feet, and arranged as a randomized complete block replicated four times. Weed control was visually evaluated on May 7, June 6, and July 21, 2015, which was 8, 13, and 20 weeks after spring application (WAST), respectively. Results and Discussion Generally, atrazine alone applied in the fall was less effective for kochia and Russian thistle control than other fall or spring-applied herbicide at 8 and 13 WAST. By 20 WAST, control of kochia and Russian thistle was 85% or less with all fall-applied herbicides. Banvel increased kochia control 16 to 17% when added to Balance Pro plus Autumn Super plus atrazine applied in the spring at 20 WAST. All other spring herbicides were similar for kochia control at 20 DAT. Russian thistle control was similar among all spring-applied herbicides except atrazine plus Banvel (76%) at 20 WAST. Authority MTZ provided equal control regardless of time of application. However, by 20 WAST, although not statistically significant, the trend suggests that later in the season spring applications might be superior. Reference Currie, R. and Geier, P. (2015) “Fallow Weed Control with Preemergence Tank Mixes of Sharpen, Zidua, Sencor, Banvel, Atrazine, Balance Pro, and Corvus,” Kansas Agricultural Experiment Station Research Reports: Vol. 1: Iss. 5. 95 93 84 91 99 86 100 94 98 95 90 0 4.5 97 96 84 94 99 90 98 91 100 91 99 0 4.7 71 76 68 78 95 78 94 89 93 89 85 0 11.4 75 85 68 95 91 96 86 90 91 76 95 0 10.5 Kansas State University Agricultural Experiment Station and Cooperative Extension Service 6


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R. Currie, P. Geier. Fallow Weed Control with Preemergence Applications of Balance Pro, Corvus, Banvel, Atrazine, and Authority MTZ, Kansas Agricultural Experiment Station Research Reports, 2016,