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Effective Fennel (Foeniculum vulgare) Control with Herbicides in Natural Habitats in California

Published online by Cambridge University Press:  20 January 2017

Carl E. Bell ,
Todd Easley  and
Kari Roesch Goodman
Carl E. Bell*
Affiliation:
Invasive Plants, University of California Cooperative Extension, 5555 Overland Ave., Suite 4101, San Diego, CA 92123
Todd Easley
Affiliation:
AC/S Environmental Security, Bldg. 22165, Camp Pendleton, CA 92055
Kari Roesch Goodman
Affiliation:
Department of Environmental Science, Policy and Management, 137 Mulford Hall, University of California at Berkeley, CA 94720–3114
*
Corresponding author's E-mail: cebell@usdavis.edu
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Abstract

Fennel is a major invasive plant in many lower elevation natural areas in coastal California. Three identical field experiments were conducted to evaluate glyphosate and triclopyr for control of fennel. Treatments included each herbicide applied alone and in various combinations. We also compared broadcast applications to spot spraying of individual fennel plants because spot spraying is a commonly used technique in natural area weed management. Most treatments controlled fennel well when evaluated 6 wk and 1 yr after treatment, with the exception of the lowest rate of glyphosate. Purple needlegrass, a native perennial grass, was present in two of the sites. In most, but not all, treatment and site combinations, it was not significantly harmed by the herbicides. The spot spray applications were less effective and used more herbicide per unit area than the broadcast spraying.

Keywords

Glyphosatetriclopyrfennel, Foeniculum vulgare P. Mill. FOEVUpurple needlegrass, Nasella pulchra (A. S. Hitchc.) BarkworthBroadcast sprayspot sprayinvasive plants
Type
Research Articles
Information
Invasive Plant Science and Management , Volume 1 , Issue 1 , January 2008 , pp. 66 - 72
Copyright
Copyright © Weed Science Society of America 

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