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Effect of Four Foliage-Applied Herbicides on Field Horsetail (Equisetum arvense)

Published online by Cambridge University Press:  12 June 2017

D. Coupland  and
D. V. Peabody
D. Coupland
Affiliation:
Weed Res. Organ., Begbroke Hill, UK 0X5 1PF
D. V. Peabody
Affiliation:
Washington State Univ., Northwestern Washington Res. and Ext. Unit, Mount Vernon, WA 98273
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Abstract

Amitrole (3-amino-s-triazole), asulam (methyl sulfanilylcarbamate), glyphosate [N-(phosphonomethyl)glycine], and fosamine [ethyl hydrogen (aminocarbonyl)phosphonate] were effective in reducing the amount of shoot regrowth from field horsetail (Equisetum arvense L.) 3 months after treatment. The order of effectiveness was amitrole > glyphosate > asulam > fosamine. The advantage of adding surfactant to the spray formulation or applying herbicides to wet foliage was rate dependent for all herbicides except fosamine. Spray retention was increased by application to wet foliage and by the inclusion of surfactant in the formulation. Spray retention increased as spray volume and plant size increased and as plant growth became prostrate. A scanning electron microscope study of the shoot surfaces showed an abundance of silica-containing structures and the presence of epicuticular wax. Certain surfaces of the scale leaves did not have these characteristics, indicating that redistribution of spray to these areas may result in greater penetration with subsequent increases in herbicide performance.

Keywords

Amitroleasulamfosamineglyphosateretention
Type
Research Article
Information
Weed Science , Volume 29 , Issue 1 , January 1981 , pp. 113 - 119
Copyright
Copyright © 1981 by the Weed Science Society of America 

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