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Preemergence Herbicide and Glyphosate Effects on Seedling Diseases in Glyphosate-Resistant Cotton

Published online by Cambridge University Press:  20 January 2017

Joseph H. Pankey ,
James L. Griffin ,
Patrick D. Colyer ,
Raymond W. Schneider  and
Donnie K. Miller
Joseph H. Pankey
Affiliation:
Department of Plant Pathology and Crop Physiology, LSU AgCenter, Baton Rouge, LA 70803
James L. Griffin
Affiliation:
Department of Agronomy, LSU AgCenter, Baton Rouge, LA 70803
Patrick D. Colyer
Affiliation:
LSU Red River Research Station, LSU AgCenter, Bossier City 71113
Raymond W. Schneider
Affiliation:
Department of Plant Pathology and Crop Physiology, LSU AgCenter, Baton Rouge, LA 70803
Donnie K. Miller*
Affiliation:
LSU Northeast Research Station, St. Joseph, LA 71366
*
Corresponding author's E-mail: dmiller@agctr.lsu.edu
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Abstract

Field experiments were conducted to evaluate the influence of preemergence (PRE) herbicides metolachlor at 1,700 g ai/ha, pyrithiobac at 70 g ai/ha, or pendimethalin at 840 g ai/ha applied alone or with fluometuron at 1,300 g ai/ha and glyphosate postemergence (POST) at 840 g ai/ha on seedling diseases in glyphosate-resistant cotton. Hypocotyl disease severity both years averaged across PRE herbicide treatments was greater after glyphosate application to four-leaf cotton than cotyledon cotton. The PRE herbicide treatments, particularly those including fluometuron, increased root and hypocotyl disease ratings compared with a nontreated control, and a sequential application of glyphosate did not further increase disease severity. Greenhouse experiments using soil infested with Rhizoctonia solani confirmed findings from the field study showing that PRE herbicides can predispose cotton to greater seedling disease injury with no increased seedling disease severity associated with application of glyphosate. In the field study, glyphosate applied at cotyledon or four-leaf growth stages decreased disease severity on cotton hypocotyls both years. This inhibitory effect of glyphosate was less evident in the greenhouse study and may have been related to species of fungi present, infestation level, and differences in environmental conditions when compared with the field.

Keywords

FluometuronglyphosatemetolachlorpendimethalinpyrithiobacRhizoctonia solanicotton, Gossypium hirsutum L.Gossypium hirsutum L.‘D&PL 5690 RR’‘D&PL 5415 RR’‘D&PL 436 RR’herbicide–pathogen interactionsseedling diseasesEPSP, enolpyruvylshikimate phosphatefb, followed byPDA, potato dextrose agarPRE, preemergencePOST, postemergence

Information

Type
Research Article
Information
Weed Technology , Volume 19 , Issue 2 , June 2005 , pp. 312 - 318
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Current address: 25 S. Lake, Monroe, LA 71203.

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