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Effect of glyphosate-treated henbit (Lamium amplexicaule) and downy brome (Bromus tectorum) on Fusarium solani f. sp. pisi and Pythium ultimum

Published online by Cambridge University Press:  12 June 2017

Michael K. Kawate ,
Susan G. Colwell ,
Alex G. Ogg Jr.  and
John M. Kraft
Susan G. Colwell
Affiliation:
Oregon State University, Corvallis, OR 97331
Alex G. Ogg Jr.
Affiliation:
U.S. Department of Agriculture, Agricultural Research Service, Washington State University, Pullman, WA 99164
John M. Kraft
Affiliation:
U.S. Department of Agriculture, Agricultural Research Service, Irrigated Agricultural Research and Extension Center, Prosser, WA 99350-9687
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Abstract

Greenhouse studies were conducted to determine the following: if treating henbit or downy brome with glyphosate increased populations of Fusarium solani f. sp. pisi and Pythium ultimum in soil and rhizosphere soil; if treating henbit or downy brome with glyphosate increased root colonization and infection by F. solani f. sp. pisi or P. ultimum; and, if henbit and downy brome are hosts of F. sohni f. sp. pisi or P. ultimum. Pythium ultimum populations increased only in soil containing glyphosate-treated henbit. Fusarium solani f. sp. pisi and P. ultimum populations increased in rhizosphere soil from glyphosate-treated henbit, while only P. ultimum populations increased in rhizosphere soil from glyphosate-treated downy brome. These results suggest that peas planted in soil where either downy brome or henbit had been treated with glyphosate could be exposed to higher populations of F. solani f. sp. pisi and P. ultimum. Root colonization and infection, plant height, and root weight data indicated that henbit and downy brome are alternate hosts of P. ultimum. F. sohni f. sp. pisi colonized, but did not readily infect roots of downy brome and henbit.

Keywords

Glyphosatedowny brome, Bromus tectorum L. BROTEhenbit, Lamium amplexicaule L. LAMAMPea, Pisum sativum L.Rhizospherehostcolonizationinfection
Type
Special Topics
Information
Weed Science , Volume 45 , Issue 5 , October 1997 , pp. 739 - 743
Copyright
Copyright © 1997 by the Weed Science Society of America 

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