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Biological Control of Parthenium (Parthenium hysterophorus) in Australian Rangeland Translates to Improved Grass Production

Published online by Cambridge University Press:  20 January 2017

K. Dhileepan
K. Dhileepan*
Affiliation:
Tropical Weeds Research Centre, Biosecurity Queensland, Department of Primary Industries and Fisheries, Charters Towers, Queensland 4820, Australia
*
Corresponding author's E-mail: kunjithapatham.dhileepan@dpi.qld.gov.au
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Abstract

Biological control of parthenium, a major weed in grazing areas in Australia, was initiated in the mid 1970s. Since then, nine species of insects and two rust fungi have been introduced. Evaluation using pesticide exclusion at two sites (Mt. Panorama and Plain Creek) in Queensland, Australia, revealed that classical biological control had a significant negative effect on the target weed, but the impact varied between years. In this study, I quantified the effects of biological control of parthenium on grass production. Grass production declined with the increase in parthenium biomass. Significant increase in grass production due to biological control was observed, but only in 1 of 4 yr at Mt. Panorama and 2 of 4 yr at Plain Creek. At Mt. Panorama, there was a 40% increase in grass biomass in 1997 because of defoliation by Zygogramma bicolorata and galling by Epiblema strenuana. At Plain Creek, grass biomass increased by 52% in 1998 because of E. strenuana and by 45% in 2000 because of combined effects of E. strenuana and the summer rust Puccinia melampodii. This study provides evidence on the beneficial effects of biological control of parthenium in areas under limited grazing.

Keywords

Parthenium, Parthenium hysterophorus L.Biological controlbeneficial impactgrass production
Type
Weed Management
Information
Weed Science , Volume 55 , Issue 5 , October 2007 , pp. 497 - 501
Copyright
Copyright © Weed Science Society of America 

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