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1 August 2015 Evaluation of Herbicide Timings for Palmer Amaranth Control in a Stale Seedbed Sweetpotato Production System
Lauren B. Coleman, Sushila Chaudhari, Katherine M. Jennings, Jonathan R. Schultheis, Stephen L. Meyers, David W. Monks
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Abstract

Studies were conducted in a stale field production system in 2012 and 2013 to determine the effect of herbicide timing on Palmer amaranth control and ‘Covington' sweetpotato yield and quality. Treatments consisted of flumioxazin at 72, 90, or 109 g ai ha−1 applied 45 d before transplanting (DBT) or 1 DBT, or sequentially the same rate at 45 DBT followed by (fb) 1 DBT; flumioxazin 109 g ha−1 applied 1 DBT fb S-metolachlor (800 g ai ha−1) at 0, 6 (± 1), or 10 d after treatment (DAT); flumioxazin at 72, 90, or 109 g ha−1 plus clomazone (630 g ai ha−1) applied 45 DBT fb S-metolachlor (800 g ha−1) applied 10 DAT; and fomesafen alone at 280 g ai ha−1 applied 45 DBT. Nontreated weed-free and weedy controls were included for comparison. Flumioxazin application time had a significant effect on Palmer amaranth control and sweetpotato yields, and the effect of flumioxazin rate was not significant. Treatments consisting of sequential application of flumioxazin 45 DBT fb 1 DBT or flumioxazin plus clomazone 45 DBT fb S-metolachlor 10 DAT provided the maximum Palmer amaranth control and sweetpotato yields (jumbo, No. 1, jumbo plus No. 1, marketable) among all treatments. Delayed flumioxazin application timings until 1 DBT allowed Palmer amaranth emergence on stale seedbeds and resulted only in 65, 62, 48, and 17% control at 14, 32, 68, and 109 DAT, respectively. POST transplant S-metolachlor applications following flumioxazin 1 DBT did not improve Palmer amaranth control, because the majority of Palmer amaranth emerged prior to S-metolachlor application. A control program consisting of flumioxazin 109 g ha−1 plus clomazone 630 g ha−1 at 45 DBT fb S-metolachlor 800 g ha−1 at 0 to 10 DAT provides an effective herbicide program for Palmer amaranth control in stale seedbed production systems in North Carolina sweetpotato.

Nomenclature: Clomazone; flumioxazin; fomesafen, S-metolachlor; Palmer amaranth, Amaranthus palmeri S. Wats. AMAPA; sweetpotato, Ipomoea batatas L. Lam. ‘Covington'.

En 2012 y 2013, se realizaron estudios en el sistema de producción en campo con siembra retrasada para determinar el efecto del momento de aplicación de herbicidas sobre el control de A. palmeri y el rendimiento y calidad de la batata ‘Covington'. Los tratamientos consistieron de flumioxazin a 72, 90, ó 109 g ai ha−1 aplicados 45 d antes del trasplante (DBT) o 1 DBT, o secuencialmente con la misma dosis a 45 DBT seguido por (fb) 1 DBT; flumioxazin 109 g ha−1 aplicados 1 DBT fb S-metolachlor (800 g ai ha−1) a 0, 6 (±1), ó 10 d después del tratamiento (DAT); flumioxazin a 72, 90, ó 109 g ha−1 más clomazone (630 g ai ha−1) aplicado 45 DBT fb S-metolachlor (800 g ha−1) aplicado 10 DAT; y fomesafen solo a 280 g ai ha−1 aplicado 45 DBT. Testigos sin tratamiento con y sin malezas fueron incluidos para fines de comparación. El momento de aplicación de flumioxazin tuvo un efecto significativo sobre el control de A. palmeri y los rendimientos de la batata, pero el efecto de la dosis de flumioxazin no fue significativo. Los tratamientos que consistían de aplicaciones secuenciales de flumioxazin 45 DBT fb 1 DBT o flumioxazin más clomazone 45 DBT fb S-metolachlor 10 DAT brindaron el máximo control de A. palmeri y los mayores rendimientos (jumbo, No. 1, jumbo plus No. 1, comercializable) entre todos los tratamientos. El retrasar el momento de aplicación de flumioxazin hasta 1 DBT permitió la emergencia de A. palmeri

Lauren B. Coleman, Sushila Chaudhari, Katherine M. Jennings, Jonathan R. Schultheis, Stephen L. Meyers, and David W. Monks "Evaluation of Herbicide Timings for Palmer Amaranth Control in a Stale Seedbed Sweetpotato Production System," Weed Technology 30(3), 725-732, (1 August 2015). https://doi.org/10.1614/WT-D-15-00133.1
Received: 26 August 2015; Accepted: 1 April 2016; Published: 1 August 2015
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