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Control of Atrazine-Resistant Palmer Amaranth (Amaranthus palmeri) in Double-Crop Grain Sorghum

Published online by Cambridge University Press:  14 March 2019

Marshall M. Hay*
Affiliation:
Graduate Student, Department of Agronomy, Kansas State University, Manhattan, KS, USA
Jeffrey J. Albers
Affiliation:
Former Graduate Student, Department of Agronomy, Kansas State University, Manhattan, KS, USA
J. Anita Dille
Affiliation:
Professor, Department of Agronomy, Kansas State University, Manhattan, KS, USA
Dallas E. Peterson
Affiliation:
Professor, Department of Agronomy, Kansas State University, Manhattan, KS, USA
*
Author for correspondence: Marshall M. Hay, Kansas State University, Department of Agronomy, 2004 Throckmorton Plant Science Center, 1712 Claflin Road, Manhattan, KS 66506. (Email: mmhay@ksu.edu)

Abstract

Double-crop grain sorghum after winter wheat harvest is a common cropping system in the southern plains region. Palmer amaranth is a troublesome weed in double-crop grain sorghum in Kansas. Populations resistant to various herbicides (e.g., atrazine, glyphosate, metsulfuron, pyrasulfotole) have made Palmer amaranth management even more difficult for producers. To evaluate control of atrazine-resistant and atrazine-susceptible Palmer amaranth in double-crop grain sorghum, we assessed 14 herbicide programs, of which 8 were PRE only and 6 were PRE followed by (fb) POST applications. Visible ratings of Palmer amaranth control were taken at 3 and 8 wk after planting (WAP) grain sorghum. PRE treatments containing very-long-chain fatty acid (VLCFA)–inhibiting herbicides provided 91% control of atrazine-resistant Palmer amaranth 3 WAP, and reduced weed density 8 WAP compared to atrazine-only PRE treatments. PRE fb POST treatments, especially those that included VLCFA-inhibiting herbicides, provided greater control (71% to 93%) of both atrazine-resistant and atrazine-susceptible Palmer amaranth, respectively, at 8 WAP compared to PRE treatments alone (59% to 79%). These results demonstrated the utility of VLCFA-inhibiting herbicides applied PRE and in a layered PRE fb POST approach in controlling atrazine-resistant Palmer amaranth, as well as the importance of an effective POST application following residual PRE herbicides for controlling both atrazine-resistant and atrazine-susceptible Palmer amaranth in double-crop grain sorghum.

Type
Research Article
Copyright
© Weed Science Society of America, 2019. 

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Footnotes

Cite this article: Hay MM, Albers JJ, Dille JA, Peterson DE (2019) Control of atrazine-resistant Palmer amaranth (Amaranthus palmeri) in double-crop grain sorghum. Weed Technol 33:115–122. doi: 10.1017/wet.2018.102

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