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Evaluation of Herbicides Applied to Soil for Control of Aquatic Weeds in Irrigation Canals

Published online by Cambridge University Press:  12 June 2017

P. A. Frank ,
R. H. Hodgson  and
R. D. Comes
P. A. Frank
Affiliation:
Crops Research Division, Agricultural Research Service, U.S. Department of Agriculture
R. H. Hodgson
Affiliation:
Crops Research Division, Agricultural Research Service, U.S. Department of Agriculture
R. D. Comes
Affiliation:
Crops Research Division, Agricultural Research Service, U.S. Department of Agriculture
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Abstract

Ninety-one herbicides and experimental compounds were evaluated for herbicidal activity on submersed aquatic weeds, Potamogeton pectinatus L. and P. nodosus Poir. Twenty-one of the compounds tested showed some phytotoxicity at 20 lb/A. The other compounds were completely inactive. 2,3,6-Trichlorophenylacetic acid (fenac) and 2,6-dichlorobenzonitrile (dichlobenil), showed outstanding activity with good persistence in water-saturated soil. Fenac and 2-(2,4,5-trichlorophenoxy)propionic acid (silvex), were tested in field trials in an irrigation canal in eastern Wyoming. The sodium salt and amide of fenac did not give adequate weed control at 5 lb/A. Spring applications of herbicides did not perform as well as fall ones. Mechanical incorporation of herbicides improved some results, but was of doubtful value.

Type
Research Article
Information
Weeds , Volume 11 , Issue 2 , April 1963 , pp. 124 - 128
Copyright
Copyright © 1963 Weed Science Society of America 

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References

Literature Cited

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