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Impact of Clipping Timing on Japanese Hedgeparsley (Torilis japonica) Seed Production and Viability

Published online by Cambridge University Press:  20 January 2017

Mark J. Renz  and
R. Menyon Heflin
Mark J. Renz*
Affiliation:
Department of Agronomy, University of Wisconsin Madison, Madison, WI 53706
R. Menyon Heflin
Affiliation:
Department of Agronomy, University of Wisconsin Madison, Madison, WI 53706
*
Corresponding author's E-mail: mrenz@wisc.edu
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Abstract

Japanese hedgeparsley is a biennial plant that invades roadsides, rights-of way, and forested areas in the midwestern United States. Interest in managing populations by mechanical or hand-clipping techniques exists, but no information is available on the appropriate timing to maximize mortality and prevent the production of viable seed. To assess that, we applied clipping treatments at five periods throughout the summer to three Japanese hedgeparsley populations in southern Wisconsin and measured the number and viability of seeds produced by each plant during the year of treatment and the survival of plants clipped. Japanese hedgeparsley plants began producing seed by mid-July, but production was not maximized until early August. Viable seeds were not produced until early or mid-August, coinciding with the presence of ripened brown fruit. Clipping at any timing resulted in > 95% mortality by the fall of the treatment year. All plants that resprouted were in the vegetative stage when clipped, and no plants survived the following year. Results indicate that clipping Japanese hedgeparsley plants when they are in a reproductive phase before fruit turns brown is an effective management strategy for this invasive plant.

Keywords

Japanese hedgeparsley, Torilis japonica (Houtt.) DC. TOIJAApiaceaeclippinginvasive plantmanagementmechanical controlreproductionseeds
Type
Research Article
Information
Invasive Plant Science and Management , Volume 7 , Issue 3 , September 2014 , pp. 511 - 516
Copyright
Copyright © Weed Science Society of America 

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