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2,4-D and Phoma herbarum to control dandelion (Taraxacum officinale)

Published online by Cambridge University Press:  20 January 2017

Parry J. Schnick  and
Greg J. Boland
Parry J. Schnick
Affiliation:
Department of Environmental Biology, University of Guelph, Guelph, ON N1G 2W1, Canada
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Abstract

Biological agents, including fungal pathogens, are being considered to control weeds such as dandelion. Compatibility of a fungal pathogen, Phoma herbarum, with nonformulated 2,4-D was tested in vitro. Moderate to high concentrations (828 to 2,451 ppm) of 2,4-D reduced fungal colony diameter by 50% or less, suggesting that practical concentrations may be chosen for tank mixes. Under growth room and field conditions, integration of 2,4-D and P. herbarum produced enhanced control of dandelion. In general, synergistic responses to sublethal doses of 2,4-D followed 4, 8, or 16 d later by P. herbarum inoculation were found. Synergistic interactions, as determined by the Colby method, ranged as high as 62% greater than expected for an additive interaction. In general, dandelion response was reduced under field conditions, suggesting that environmental conditions or other factors play a role in efficacy. Integration of chemical and biological agents shows potential for enhanced weed control.

Keywords

2,4-Ddandelion, Taraxacum officinale Weber in Wiggers TAROFPhoma herbarumBioherbicidemycoherbicidebiocontrolintegrated weed management
Type
Weed Management
Information
Weed Science , Volume 52 , Issue 5 , October 2004 , pp. 808 - 814
Copyright
Copyright © Weed Science Society of America 

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