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Responses of Monoecious and Dioecious Hydrilla (Hydrilla verticillata) to Various Concentrations and Exposures of Diquat

Published online by Cambridge University Press:  12 June 2017

Thai K. Van ,
Kerry K. Steward  and
Richard D. Conant Jr.
Thai K. Van
Affiliation:
Aquatic Plant Management Lab., Agric. Res. Serv., U.S. Dep. Agric., Fort Lauderdale, FL 33314
Kerry K. Steward
Affiliation:
Aquatic Plant Management Lab., Agric. Res. Serv., U.S. Dep. Agric., Fort Lauderdale, FL 33314
Richard D. Conant Jr.
Affiliation:
Aquatic Plant Management Lab., Agric. Res. Serv., U.S. Dep. Agric., Fort Lauderdale, FL 33314
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Abstract

Control of monoecious and dioecious hydrilla [Hydrilla verticillata (L.f.) Royle # HYLLI] biotypes required a minimum 2 days of exposure to diquat (6,7-dihydrodipyrido [1,2-α:2′,1′-c] pyrazinediium ion) at a concentration of 0.25 mg/L under laboratory conditions. When treatment concentration was increased to 2.0 mg/L diquat, the minimum required contact time was reduced to 6 or 12 h depending on plant growth stage. Early growth emerging from sprouting tubers appeared to be more susceptible to diquat treatments. Herbicide uptake was linear during a 4-day exposure to 14C-diquat up to 1.0 mg/L, and the amounts of radioactivity in plant tissue varied proportionally with ambient levels of 14C-diquat in water. The lethal concentration of diquat in hydrilla tissue was estimated to be 81 μg/g plant dry weight when hydrilla was exposed to diquat at 0.25 mg/L for 2 days.

Keywords

Herbicide uptakebioconcentration factorlethal concentrationcontact timeaquatic weedHYLLI
Type
Weed Control and Herbicide Technolgy
Information
Weed Science , Volume 35 , Issue 2 , March 1987 , pp. 247 - 252
Copyright
Copyright © 1987 by the Weed Science Society of America 

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References

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