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Evaluation of Triclopyr and Mycoleptodiscus terrestris for Control of Eurasian Watermilfoil (Myriophyllum spicatum)

Published online by Cambridge University Press:  20 January 2017

Linda S. Nelson  and
Judy F. Shearer
Linda S. Nelson*
Affiliation:
Environmental Laboratory, U.S. Army Engineer Research and Development Center, 3909 Halls Ferry Road, Vicksburg, MS 39180
Judy F. Shearer
Affiliation:
Environmental Laboratory, U.S. Army Engineer Research and Development Center, 3909 Halls Ferry Road, Vicksburg, MS 39180
*
Corresponding author's E-mail: Linda.S.Nelson@usace.army.mil
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Abstract

Growth chamber studies were conducted using 55-L aquariums to evaluate the efficacy of the herbicide triclopyr and the fungal pathogen Mycoleptodiscus terrestris, applied alone and in combination against Eurasian watermilfoil. Treatments included 0.15, 0.40, and 1.50 mg acid equivalent (ae)/L triclopyr, 0.08, 0.16, and 0.32 ml/L M. terrestris, combinations of both agents at all rates, and an untreated control. Plants were exposed to all treatments for a 24-h contact time and plant biomass (shoot and roots) was recorded 6 wk after application. For both triclopyr and M. terrestris applied alone, plant control increased with treatment concentration. Compared with untreated plants, 1.50 mg/L triclopyr and 0.32 ml/L M. terrestris reduced Eurasian watermilfoil by 100 and 91%, respectively. Lower doses of herbicide or pathogen were less effective and plant recovery was observed from surviving plant tissues (stems and root crowns). Although M. terrestris at 0.08 ml/L did not significantly reduce shoot or root biomass and 0.15 mg/L triclopyr provided only 53% control of plants, combining both agents at these rates reduced Eurasian watermilfoil by 90%. Results demonstrated that integrating low doses of triclopyr with an indigenous pathogen, M. terrestris, can improve control of Eurasian watermilfoil. Lower use rates of triclopyr would minimize impacts to sensitive nontarget vegetation, reduce application costs, and may minimize impacts of label-imposed use restrictions.

Keywords

TriclopyrEurasian watermilfoil, Myriophyllum spicatum L. MYPSPMycoleptodiscus terrestris (Gerd.) OstazeskiAquatic plant managementfungal pathogenintegrated weed managementinvasive species
Type
Research
Information
Invasive Plant Science and Management , Volume 1 , Issue 4 , October 2008 , pp. 337 - 342
Copyright
Copyright © Weed Science Society of America 

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