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Diquat and Copper-ion Residues in Salmon-spawning Channel

Published online by Cambridge University Press:  12 June 2017

R. R. Yeo  and
N. Dechoretz
R. R. Yeo
Affiliation:
Agric. Res. Serv., U.S. Dep. of Agric., Davis, CA 95616
N. Dechoretz
Affiliation:
Agric. Res. Serv., U.S. Dep. of Agric., Davis, CA 95616
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Abstract

A mixture of diquat [6,7-dihydrodipyrido(1,2-α: 2′,1′-c) pyrazinediium ion] and copper sulfate pentahydrate was applied to artificial chinook salmon (Onchorhynchus tshawytscha Wal.) spawning channels to reduce excessive growths of algae [Cladophora glomerata (L.) Kutz]. Juvenile salmon were not harmed by the applications. A concentration of 100 ppb w/w diquat plus 150 ppb copper-ion was maintained for 3 hr. The alga was controlled satisfactorily for distances up to 0.5 km per treatment. Each treatment consisted of one to three applications, each made on consecutive days. Water temperature was 11.2 C during three winter applications and 15.5 C during a spring application. Diquat was rapidly sorbed out of the treated water to 3.8 ppb at 1.6 km. Copper-ion residues dissipated to 60 ppb at 1.6 km.

Type
Research Article
Information
Weed Science , Volume 24 , Issue 4 , July 1976 , pp. 405 - 409
Copyright
Copyright © 1976 by the Weed Science Society of America 

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