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

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 inf...

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Bibliographic Details
Published in:Weed science 1997-09, Vol.45 (5), p.739-743
Main Authors: Kawate, Michael K., Colwell, Susan G., Ogg, Alex G., Kraft, John M.
Format: Article
Language:English
Subjects:
Fungi
Fusarium
Orchard soils
Peas
Plant roots
Plants
Rhizosphere
Silt loam soils
Silty soils
Soil water
Special Topics
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Summary: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.
ISSN:0043-1745
1550-2759
DOI:10.1017/S0043174500093437