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Published byMeredith Wiggans
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Response of Glyphosate-Resistant Palmer Amaranth to Thirteen Residual Herbicides Jeremy Kichler
The Objective of this Study was to Determine The Most Effective Residual Herbicides for Use in Cotton 1. At planting 2. Postemergence 3. Layby
Two Locations in 2006 Macon County, Georgia Robeson County, North Carolina
Methods Plot Size – 6 feet by feet Conventional Tillage All herbicides applied to soil without debris
Planting Dates and Rainfall Planting/Application Dates May 1, 2006 – Macon County, GA May 24, 2006 – Robeson County, NC Factorial treatment 13 herbicides 2 herbicide rates 4 replications
Herbicide Treatments and 1X Rates Caparol (2 pt) Cotoran (2 pt) Direx (2 pt) Dual Magnum (1 pt) Envoke (0.1 oz) Layby Pro (2 pt) Linex (2 pt) Prowl H2O (2 pt) Reflex (1 pt) Stalwart (1 pt) Staple LX (1.7 oz) Suprend (1.0 lb) Valor SX (1.5 oz) All treatments were applied at 1X and 1.5X rates
Data Reporting Data from both GA and NC reported by location at two evaluation dates Rate main effect significant Herbicide treatment main effect significant
Percent Palmer Control Averaged Over Herbicide Treatments, DAT. RateGANC 1 X X9387 LSD23
RateGANC 1 X X8368 LSD45 Percent Palmer Control Averaged Over Herbicide Treatments, DAT.
Herbicide Options Caparol Cotoran Direx Prowl Reflex Staple Direx Layby Pro Linex Suprend Valor SX Dual Mag. Envoke Stalwart Staple At-PlantingPOSTLayby
LSD: GA = 6; NC = 6 *Data pooled over two rates. Percent Palmer Control by PRE Applied Residual Herbicides DAT.*
*Data pooled over rates. Palmer Amaranth Control by PRE Applied Residual Herbicides DAT.* LSD: GA = 10; NC =
Planting Dates and Rainfall Rainfall: GANC week 14.5 in0.4 in week 2-30 in2.99 in week 4-50 in2.08 in
115 ReflexStaple GA
115 ReflexStaple NC
*Data pooled over rates. Palmer Amaranth Control by POST Applied Residual Herbicides DAT.* LSD: GA = 6; NC =
*Data pooled over rates. Palmer Amaranth Control by POST Applied Residual Herbicides DAT.* LSD: GA = 10; NC =
StalwartDual Mag. GA
Palmer Amaranth Control by Layby Applied Residual Herbicides DAT.* *Data pooled over rates. LSD: GA = 6; NC =
Palmer Amaranth Control by Layby Applied Residual Herbicides DAT.* *Data pooled over rates. LSD: GA = 10; NC =
Conclusions At-Planting Options -- Reflex or Staple Topical Options -- Staple or Dual Magnum Layby Directed Options -- Suprend or Valor
Conclusions Caution with Staple and Suprend due to growing occurrences of ALS inhibitor resistance. In fields without ALS resistance we recommend only 1 application of an ALS herbicide per season.
Managing glyphosate-resistant Palmer amaranth in Liberty Link ® cotton. A.W. MacRae 1, A.S. Culpepper 1, and J.M. Kichler 2 1 Crop and Soil Sciences Department.
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Taproot of Palmer Amaranth Allen 2009 Living with Palmer amaranth in Georgia cotton.
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Diversity and Integration: Keys to Surviving in a Palmer World Stanley Culpepper, University of Georgia, Tifton.
2012 Cotton Production Meeting Stanley Culpepper, University of Georgia, Tifton.
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2011: Impact of cover crop residue and tillage on the control of glyphosate-resistant Palmer amaranth.
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Diversity and Integration To Preserve Conservation Tillage Stanley Culpepper, University of Georgia, Tifton.
Peanut Weed Control Update (County Extension Agents) Eric P. Prostko Professor and Extension Weed Specialist Department of Crop & Soil Sciences.
Eric P. Prostko, Ph.D. Professor and Extension Weed Specialist Dept. Crop & Soil Sciences Whole-Farm Weed Management Practices For Palmer Amaranth Control.
2014 Beltwide: Time of Day Influence on Control of Palmer Amaranth by Dicamba Tank Mixes Culpepper, Eure, Grey, Fowler.
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2014: Herbicide Resistance Changes Agriculture Forever Stanley Culpepper Tifton, GA.
2016 Vegetable Weed Control Mechanical Cultural Herbicide/ Fumigant DIVERSIFICATION.
Soybean Weed Control Eric P. Prostko Extension Weed Specialist Department of Soil & Crop Science The University of Georgia.
Control of Tropical Spiderwort in Peanut with Selected Herbicides J. Tim Flanders Grady County Extension Coordinator Eric P. Prostko Dept. of Crop & Soil.
2012: Weed Management and Crop Injury when Intercropping Melons and Cotton Peter Eure*, Stanley Culpepper, Brian Tankersley, and Rand Merchant The University.
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