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Yellow Nutsedge Control and Reduced Tuber Production with S-metolachlor, Halosulfuron plus Dicamba, and Glyphosate in Furrow-Irrigated Corn

Published online by Cambridge University Press:  20 January 2017

Joel Felix  and
George Newberry
Joel Felix*
Affiliation:
Oregon State University/Malheur Experiment Station, 595 Onion Avenue, Ontario, OR 97914
George Newberry
Affiliation:
Gowan Company,1411 S. Arcadia Street, Boise, ID 83705
*
Corresponding author's E-mail: joel.felix@oregonstate.edu
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Abstract

Yellow nutsedge is an important weed problem in furrow-irrigated fields in the Treasure Valley of eastern Oregon and southwestern Idaho. Field studies were conducted in 2008 and 2009 to evaluate the effect of PPI S-metolachlor or EPTC followed by POST halosulfuron and dicamba plus glyphosate or glyphosate alone on foliar yellow nutsedge control and tuber production in corn. Corn plant height at 8 and 24 d after treatment (DAT) was reduced 20 and 17%, respectively, in POST herbicides alone compared with PPI plus POST herbicide treatments. Yellow nutsedge control at 8 DAT averaged 78% for treatments that included PPI application of EPTC or S-metolachlor 1,600 g ai ha−1 followed by halosulfuron plus dicamba (35 plus 155 g ha−1 or 70 plus 310 g ha−1) plus glyphosate 785 g ha−1 compared with POST treatments alone (49%). The control at 24 DAT was 84% for treatments that contained halosulfuron plus dicamba compared with 73% for POST glyphosate alone. Yellow nutsedge tubers were reduced 56 to 68% among treatments at the end of 2008. Tuber reduction in 2009 was greater with treatments that included PPI herbicides followed by sequential halosulfuron plus dicamba (35 plus 155 g ha−1) plus glyphosate compared with glyphosate alone. Corn yield reflected the level of yellow nutsedge control and early-season weed interference. Treatments that included PPI herbicides had an average yield of 8.2 T ha−1 compared with 6.6 T ha−1 with sequential glyphosate alone. There was a correlation between percent foliar control and the number of yellow nutsedge tubers produced at the end of each year. Application of PPI herbicides followed by POST halosulfuron plus dicamba (35 plus 155 g ha−1 or 70 plus 155 g ha−1) plus glyphosate improved yellow nutsedge control, reduced early corn–weed competition, and produced the highest corn yield under furrow-irrigated conditions.

Cyperus esculentus es una maleza problemática importante en campos irrigados por surco en el valle Treasure del este de Oregón y suroeste de Idaho. En 2008 y 2010 se realizaron estudios de campo para evaluar el efecto de S—metolachlor incorporado antes de la siembra (PPI) o EPTC seguido por aplicaciones POST de halosulfuron y dicamba más glifosato o glifosato solo en el control foliar de C. esculentus y la producción de tubérculos, en el cultivo de maíz. La altura de las plantas de maíz a los 8 y 24 DAT se redujo 20 y 17%, respectivamente, en la aplicación de herbicidas POST solos, en comparación con los tratamientos PPI más POST. El control de C. esculentus a los 8 DAT promedió 78% para los tratamientos que incluyeron aplicación PPI de EPTC o S-metolachlor 1,600 g ia ha−1 seguido de halosulfuron más dicamba (35 más 155 g ha−1 o 70 más 310 g ha−1) más glifosato 785 g ha−1, en comparación con solo tratamientos POST (49%). El control a los 24 DAT fue de 84% para tratamientos que contenían halosulfuron más dicamba comparado a 73% con solo glifosato POST. La reducción en el número de tubérculos de C. esculentus fue de 56 a 68% entre los tratamientos al final de 2008. La reducción en el número de tubérculos en 2009 fue mayor con los tratamientos que incluyeron herbicidas PPI seguidos secuencialmente de halosulfuron más dicamba (35 más 155 g ha−1) más glifosato comparados a solo glifosato. El rendimiento del maíz reflejó el nivel de control de C. esculentus y la interferencia de la maleza temprano en el ciclo del cultivo. Los tratamientos que incluyeron herbicidas PPI tuvieron un rendimiento promedio de 8.2 T ha−1 comparado a 6.6 T ha−1 con solo glifosato secuencial. Hubo una correlación entre el porcentaje de control foliar y el número de tubérculos de C. esculentus producidos al fin de cada año. La aplicación de herbicidas PPI seguida de aplicaciones POST de halosulfuron más dicamba (35 más 155 g ha−1 o 70 más 155 g ha−1) más glifosato mejoró el control de C. esculentus, redujo la competencia de la maleza en la etapa temprana del maíz y produjo el más alto rendimiento del maíz en condiciones de irrigación por surcos.

Keywords

EPTCdicambaglyphosatehalosulfuronS-metolachloryellow nutsedge, Cyperus esculentus L.corn, Zea mays L., ‘DK C52-59-RR’Furrow irrigationyellow nutsedge controlhalosulfurontuber reduction
Type
Weed Management—Major Crops
Information
Weed Technology , Volume 26 , Issue 2 , June 2012 , pp. 213 - 219
Copyright
Copyright © Weed Science Society of America 

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