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Fluridone-Resistant Hydrilla (Hydrilla verticillata) Is Still Dominant in the Kissimmee Chain of Lakes, FL

Published online by Cambridge University Press:  20 January 2017

Michael D. Netherland  and
Dean Jones
Michael D. Netherland*
Affiliation:
U.S. Army Engineer Research and Development Center, Center for Aquatic and Invasive Plants, Gainesville, FL 32653
Dean Jones
Affiliation:
University of Florida Center for Aquatic and Invasive Plants, Lake Alfred, FL 33850
*
Corresponding author's E-mail: mdnether@ufl.edu
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Abstract

The invasive aquatic plant hydrilla rapidly spread through the 28,500 ha Kissimmee Chain of Lakes (KCOL) system in Florida in the late 1980s and early 1990s. Large-scale herbicide treatments with fluridone were initiated in 1993 and resulted in widespread reduction in hydrilla; however, by 2000, sustained use of fluridone resulted in dominance of fluridone-resistant strains of hydrilla throughout these lakes. The last large-scale fluridone applications on the KCOL were conducted in 2004, and in 2012, a sampling effort was initiated to determine the status of fluridone-resistant strains of hydrilla given an 8-yr period with no further selection pressure from fluridone. A total of 260 sites were sampled on the lakes during March, May, September, and December 2012. Plants were returned to the lab and exposed to fluridone at concentrations of 5, 10, and 20 μg L−1 and a pulse-amplitude-modulated (PAM) fluorometer was utilized to measure fluorescence yield of new shoot tissue growth following a 14-d exposure period. Results indicate that 80 to 90% of the sites sampled on the four lakes of the Kissimmee Chain remain resistant to fluridone. Three distinct patterns of response to fluridone were noted, suggesting that susceptible, moderately tolerant, and highly tolerant strains of hydrilla currently coexist on these lakes. Although fluridone-susceptible plants were present on the KCOL, this study clearly demonstrates that most of the hydrilla remained resistant despite an 8-yr period with no fluridone selection pressure.

Keywords

Fluridonehydrilla, Hydrilla verticillata (L.f). Royle HYLLIAquatic herbicideinvasive aquatic plantsubmersed aquatic vegetation
Type
Research Article
Information
Invasive Plant Science and Management , Volume 8 , Issue 2 , June 2015 , pp. 212 - 218
Copyright
Copyright © Weed Science Society of America 

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References

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