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Evaluation of Flumioxazin and S-metolachlor Rate and Timing for Palmer Amaranth (Amaranthus palmeri) Control in Sweetpotato

Published online by Cambridge University Press:  20 January 2017

Stephen L. Meyers ,
Katherine M. Jennings ,
Jonathan R. Schultheis  and
David W. Monks
Stephen L. Meyers*
Affiliation:
Department of Horticultural Science, North Carolina State University, Raleigh, NC 27695
Katherine M. Jennings
Affiliation:
Department of Horticultural Science, North Carolina State University, Raleigh, NC 27695
Jonathan R. Schultheis
Affiliation:
Department of Horticultural Science, North Carolina State University, Raleigh, NC 27695
David W. Monks
Affiliation:
Department of Horticultural Science, North Carolina State University, Raleigh, NC 27695
*
Corresponding author's E-mail: [email protected].
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Abstract

Studies were conducted in 2007 and 2008 to determine the effect of flumioxazin and S-metolachlor on Palmer amaranth control and ‘Beauregard’ and ‘Covington’ sweetpotato. Flumioxazin at 0, 91, or 109 g ai ha−1 was applied pretransplant 2 d before transplanting alone or followed by (fb) S-metolachlor at 0, 0.8, 1.1, or 1.3 kg ai ha−1 PRE applied immediately after transplanting or 2 wk after transplanting (WAP). Flumioxazin fb S-metolachlor immediately after transplanting provided greater than 90% season-long Palmer amaranth control. S-metolachlor applied alone immediately after transplanting provided 80 to 93% and 92 to 96% control in 2007 and 2008, respectively. Flumioxazin fb S-metolachlor 2 WAP provided greater than 90% control in 2007 but variable control (38 to 79%) in 2008. S-metolachlor applied alone 2 WAP did not provide acceptable Palmer amaranth control. Control was similar for all rates of S-metolachlor (0.8, 1.1, and 1.3 kg ha−1). In 2008, greater Palmer amaranth control was observed with flumioxazin at 109 g ha−1 than with 91 g ha−1. Sweetpotato crop injury due to treatment was minimal (< 3%), and sweetpotato storage root length to width ratio was similar for all treatments in 2007 (2.5 for Beauregard) and 2008 (2.4 and 1.9 for Beauregard and Covington, respectively). Sweetpotato yield was directly related to Palmer amaranth control. Results indicate that flumioxazin pretransplant fb S-metolachlor after transplanting provides an effective herbicide program for control of Palmer amaranth in sweetpotato.

Se llevaron al cabo estudios durante 2007 y 2008 para determinar el efecto de flumioxazin y S-metolachlor en el control de la Amaranthus palmeri S. e Ipomoea batatas L. Lam. ‘Covington’ y ‘Beauregard’. El flumioxazin a 0, 91, o 109 g ia ha−1 se aplicó solo 2 días antes del transplante o seguido de (fb) S-metolachlor a 0, 0.8, 1.1, o 1.3 kg ia ha−1 PRE aplicado inmediatamente después de ser transplantado ó 2 semanas después de la siembra (WAP). El Flumioxazin fb S-metolachlor aplicado inmediatamente después de la transplante, proporcionó > 90% de control de la Amaranthus palmeri S durante la estación. El S-metolachlor aplicado por sí solo inmediatamente después del transplante proporcionó del 80 al 93% y del 92 al 96% de control en 2007 y 2008 respectivamente. El flumioxazin fb S-metolachlor aplicado 2 WAP proporcionó > 90% de control en 2007 pero en el 2008 se obtuvo un control variable (del 38 al 79%). El S-metolachlor aplicado solo 2 WAP, no tuvo como resultado un control aceptable de la Amaranthus palmeri S. El control fue similar para todas las dosis de S-metolachlor (0.8, 1.1, y 1.3 kg ha−1). En el 2008, se observó un mayor control de la Amaranthus palmeri S. con el uso de flumioxazin a 109 g ha−1 que con la aplicación de 91 g ha−1. El daño al fruto de Ipomoea batatas L. debido al tratamiento fue mínimo (< 3%) y la proporción entre el largo y el ancho del tubérculo en condiciones de almacenamiento fue similar para todos los tratamientos en 2007 (2.5 para Beauregard) y en el 2008 (2.4 y 1.9 para Beauregard y Covington, respectivamente). El rendimiento del Ipomoea batatas L. estuvo directamente relacionado con el control de la Amaranthus palmeri S. Los resultados indican que el Flumioxazin aplicado antes del transplante con el fb S-metolachlor después del transplante ofrece un programa efectivo de herbicida para controlar la Amaranthus palmeri S. en el cultivo del Ipomoea batatas L.

Keywords

FlumioxazinS-metolachlorPalmer amaranth, Amaranthus palmeri S. Wats. AMAPAsweetpotato, Ipomoea batatas L. Lam. ‘Covington’, ‘Beauregard’Crop injuryherbicideweed controlyield loss
Type
Weed Management—Other Crops/Areas
Information
Weed Technology , Volume 24 , Issue 4 , December 2010 , pp. 495 - 503
Copyright
Copyright © Weed Science Society of America 

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