Weed Control with Accent, Callisto, Isoxadifen, Impact, Cinch, Dicamba, and Atrazine in Irrigated Corn

Kansas Agricultural Experiment Station Research Reports, Aug 2016

Some timings and combinations of the herbicides tested in this study controlled Palmer amaranth, kochia, quinoa, Russian thistle, and green foxtail from 95 to 100% 51 days after postemergence application (DA-B). Accent (nicosulfuron) plus Callisto (mesotriĀ­one) and isoxadifen alone postemergence provided 88% Palmer amaranth control at 51 DA-B. Kochia control was 92 and 90% when Accent plus Callisto and isoxadifen alone or with atrazine and Dicamba XP (dicamba) was applied postemergence following Cinch (S-metolachlor) preemergence application. Crabgrass control with preemergence followed by postemergence treatments exceeded 89%. Crabgrass control was 83 and 88% when no preemergence herbicide was applied prior to postemergence herbicides. No herbicide treatment increased corn yield relative to the untreated controls.

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Weed Control with Accent, Callisto, Isoxadifen, Impact, Cinch, Dicamba, and Atrazine in Irrigated Corn

Weed Control with Accent, Callisto, Isoxadifen, Impact, Cinch, Dicamba, and Atrazine in Irrigated Corn R . Currie 0 Kansas State University 0 0 P. Geier 0 0 Kansas State University , 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 Currie, R. and Geier, P. (2016) "Weed Control with Accent, Callisto, Isoxadifen, Impact, Cinch, Dicamba, and Atrazine in Irrigated Corn," Kansas Agricultural Experiment Station Research Reports: Vol. 2: Iss. 7. https://doi.org/10.4148/2378-5977.1267 - 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 Accent, Callisto, Isoxadifen, Impact, Cinch, Dicamba, and Atrazine in Irrigated Corn Abstract Some timings and combinations of the herbicides tested in this study controlled Palmer amaranth, kochia, quinoa, Russian thistle, and green foxtail from 95 to 100% 51 days after postemergence application (DA-B). Accent (nicosulfuron) plus Callisto (mesotrione) and isoxadifen alone postemergence provided 88% Palmer amaranth control at 51 DA-B. Kochia control was 92 and 90% when Accent plus Callisto and isoxadifen alone or with atrazine and Dicamba XP (dicamba) was applied postemergence following Cinch (S-metolachlor) preemergence application. Crabgrass control with preemergence followed by postemergence treatments exceeded 89%. Crabgrass control was 83 and 88% when no preemergence herbicide was applied prior to postemergence herbicides. No herbicide treatment increased corn yield relative to the untreated controls. 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/iss7/22 2016 SWREC Agricultural Research Weed Control with Accent, Callisto, Isoxadifen, Impact Cinch, Dicamba, and Atrazine in Irrigated Corn R. Currie and P. Geier Summary Some timings and combinations of the herbicides tested in this study controlled Palmer amaranth, kochia, quinoa, Russian thistle, and green foxtail from 95 to 100% 51 days after postemergence application (DA-B). Accent (nicosulfuron) plus Callisto (mesotrione) and isoxadifen alone postemergence provided 88% Palmer amaranth control at 51 DA-B. Kochia control was 92 and 90% when Accent plus Callisto and isoxadifen alone or with atrazine and Dicamba XP (dicamba) was applied postemergence following Cinch (S-metolachlor) preemergence application. Crabgrass control with preemergence followed by postemergence treatments exceeded 89%. Crabgrass control was 83 and 88% when no preemergence herbicide was applied prior to postemergence herbicides. No herbicide treatment increased corn yield relative to the untreated controls. Introduction Accent has been used for weed control in corn for more than 25 years. It provides excellent control of sorghum and some very small grass spp. Also, it can sometimes improve broadleaf weed control of other herbicides if the weed in question is not resistant to herbicides from the ALS family. It is not, however, a stand-alone treatment for weed control in corn if weeds other than Sorghum spp. are present. Therefore, the objective of this study was to explore tank mix partners that add value to Accent. Procedures An experiment conducted at the Kansas State University Southwest Research-Extension Center near Garden City, KS investigated the efficacy of Accent, Callisto, and isoxadifen along with several tank mix partners postemergence in corn. The experimental area was seeded with a mixture of kochia, green foxtail, crabgrass, and quinoa seed prior to corn planting. Quinoa seed was used as a surrogate for lambsquarters. All other weed populations were naturally occurring. Preemergence herbicides were applied May 18, 2015, and postemergence applications occurred on June 16, 2015. Corn was 6 to 9 inches tall at the time of postemergence treatment, and weeds were 1 to 5 inches tall. All herbicides were applied with a tractor-mounted, compressed-CO2 sprayer delivering 20 gpa at 30 psi and 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 in a randomized complete block with four replications. Weed control was visually rated on August 6, 2015, 51 days after postemergence application (DA-B). Corn yields were determined October 10, 2015, by harvesting the center two rows of each plot with a plot combine and adjusting the weights to 15.5% moisture. Results and Discussion All herbicides controlled quinoa 100%, Russian thistle 95 to 100%, and green foxtail 96% or more at 51 DA-B. Palmer amaranth control was 95% or more when Accent plus Callisto and isoxadifen were applied postemergence with atrazine or when these herbicides were applied following a preemergence herbicide treatment. Accent plus Callisto and isoxadifen alone postemergence provided 88% Palmer amaranth control at 51 DA-B. Similarly, Accent plus Callisto and isoxadifen alone postemergence controlled kochia 95% at 51 DA-B. Kochia control was 92 and 90% when Accent plus Callisto and isoxadifen alone or with atrazine and Dicamba XP (dicamba) were applied postemergence following Cinch preemergence. Crabgrass control with preemergence followed by postemergence treatments exceeded 90% except when Cinch preemergence was followed by Accent plus Callisto, isoxadifen, atrazine, and Dicamba XP (89%). Crabgrass control was 83 and 88% when no preemergence herbicide was applied prior to postemergence herbicides. No herbicide treatment increased corn yield relative to the untreated controls. 100 95 98 97 90 98 99 96 100 100 100 100 100 185.1 98 89 98 96 99 a All plots received Starane Ultra (fluroxypyr) at 18.3 oz/a plus nonionic surfactant at 0.25% v/v preemergence. COC is crop oil concentrate, AMS is ammonium sulfate, and MSO is methylated seed oil. Kansas State University Agricultural Experiment Station and Cooperative Extension Service


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R. Currie, P. Geier. Weed Control with Accent, Callisto, Isoxadifen, Impact, Cinch, Dicamba, and Atrazine in Irrigated Corn, Kansas Agricultural Experiment Station Research Reports, 2016,