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Monitoring a Gall Midge Population on Russian Knapweed (Acroptilon repens)

Published online by Cambridge University Press:  20 January 2017

Kathleen Meyers ,
Nancy Pieropan  and
Timothy Collier
Kathleen Meyers
Affiliation:
Department of Ecosystem Science and Management, University of Wyoming, Laramie, WY 82072, and Technician, U.S. Department of Agriculture, Animal and Plant Health Inspection Service, Plant Protection and Quarantine, Cheyenne, WY 82001
Nancy Pieropan
Affiliation:
Fremont County Weed and Pest, Lander, WY 82520
Timothy Collier*
Affiliation:
Department of Ecosystem Science and Management, University of Wyoming, Laramie, WY 82072
*
Corresponding author's E-mail: [email protected]
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Abstract

This paper describes postrelease monitoring of a population of Jaapiella ivannikovi, a gall-forming midge that was introduced for biological control of Russian knapweed. In 2011 to 2013, from late May to early June through August, we monitored 100 permanent plots at one of the first release sites of J. ivannikovi in central Wyoming. Based on the phenology of gall formation, an appropriate window for collection of galls to distribute to new sites is from early to mid-June through early August. Although J. ivannikovi established successfully, 4 yr after release, the percentage of ramets that were galled remained low (1 to 2%), indicating that J. ivannikovi is not yet having a significant effect on Russian knapweed at the site.

Keywords

Russian knapweed, Acroptilon repens (L.) DC., ACRE3Biological controlphenologypopulation dynamics
Type
Research Article
Information
Invasive Plant Science and Management , Volume 8 , Issue 4 , December 2015 , pp. 409 - 414
Copyright
Copyright © Weed Science Society of America 

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