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Tarping and Inundation as Potential Control Mechanisms for Seed Banks of Red Sesbania (Sesbania punicea)

Published online by Cambridge University Press:  03 April 2017

Robin B. Hunter
Affiliation:
Department of Environmental Science, Environmental Management Program, University of San Francisco, 2130 Fulton Street, San Francisco, CA, 94117
John C. Callaway
Affiliation:
Department of Environmental Science, Environmental Management Program, University of San Francisco, 2130 Fulton Street, San Francisco, CA, 94117
Andrew P. Rayburn
Affiliation:
River Partners, 580 Vallombrosa Avenue, Chico, CA. 95926
Gretchen C. Coffman*
Affiliation:
Department of Environmental Science, Environmental Management Program, University of San Francisco, 2130 Fulton Street, San Francisco, CA, 94117
*
Corresponding author's E-mail: rbhunter@usfca.edu

Abstract

The exotic shrub red sesbania is an increasingly problematic weed in riparian and wetland ecosystems of California. Current control methods focus on manual removal, followed by herbicide application. Although this method effectively removes mature stands, the control is temporary because the presence of a large seed bank results in rapid germination and growth of new seedlings. We measured the density of seed banks beneath stands of varying densities and evaluated the potential of tarping and inundation for control of red sesbania seed banks. As expected, the abundance of viable red sesbania seeds in the soil was significantly greater beneath high-density stands than it was beneath low-density stands. Results for inundation and tarping experiments were mixed. Sustained inundation significantly decreased survivorship of germinated seeds compared with the control, as well as causing a statistically significant reduction in germination. Seven months after tarping, during the fall/winter growing season, there was no significant effect on red sesbania seedling abundance, stump resprout abundance, or height. Germination in the laboratory was significantly reduced by extended exposure to temperatures of 60 C, although lower temperatures did not reduce germination. Red sesbania appears to be resilient to tarping as a control method, at least in the settings studied.

Type
Research
Copyright
Copyright © 2016 by the Weed Science Society of America 

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Footnotes

Current address of third author: Consulting Ecologist, Golden, CO, 80401

Associate Editor for this paper: Edith B. Allen, University of California, Riverside.

References

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