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Effect of Three Formulations on Uptake and Efficacy of Copper in Hydrilla verticillata

Published online by Cambridge University Press:  12 June 2017

Lars W.J. Anderson ,
Nathan Dechoretz ,
David Bayer  and
Gary L. Darmstadt
Lars W.J. Anderson
Affiliation:
USDA/ARS Aquatic Weeds Res. Lab. Univ. California, Davis, CA 95616
Nathan Dechoretz
Affiliation:
USDA/ARS Aquatic Weeds Res. Lab. Univ. California, Davis, CA 95616
David Bayer
Affiliation:
Botany Dep., Univ. California, Davis, CA 95616
Gary L. Darmstadt
Affiliation:
Botany Dep., Univ. California, Davis, CA 95616
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Abstract

Copper content and growth of excised hydrilla [Dioecious Hydrilla verticillata (L.f.) Royle # HYLLI] apical shoot segments were determined following exposure to copper sulfate (CuSO4), copper-triethanolamine (Cu-TEA), and copper-ethylenediamine (Cu-EDA). For all copper formulations, inhibition of growth was related to the amount of copper associated with the excised shoots. At equal copper exposure, the Cu-EDA formulation produced the greatest inhibition of growth and generally the highest copper levels in the plants. The Cu-EDA formulation inhibited dry weight gain by more than 80% 3 weeks after a 2-h exposure to 2.0 or 4.0 ppmw copper. Under similar conditions, CuSO4 or Cu-TEA produced 60% inhibition. The presence or absence of light during a 2-h exposure had no effect on the efficacy of uptake of copper from any of the formulations. Formulation-dependent differences in the mechanism of copper uptake is suggested because rinsing of exposed shoots with dilute acid (0.01N HNO3) removed copper from shoots treated with CuSO4 or Cu-TEA but not from those treated with Cu-EDA.

Keywords

Aquatic weedcopper sulfatechelateregrowthheavy metalHYLLI
Type
Weed Control and Herbicide Technolgy
Information
Weed Science , Volume 35 , Issue 2 , March 1987 , pp. 263 - 269
Copyright
Copyright © 1987 by the Weed Science Society of America 

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