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BioControl

, Volume 64, Issue 1, pp 91–101 | Cite as

Folivory impact of the biocontrol beetle, Cassida rubiginosa, on population growth of Cirsium arvense

  • Michael G. CrippsEmail author
  • Sarah D. Jackman
  • Chikako van Koten
Article
  • 58 Downloads

Abstract

The folivorous beetle, Cassida rubiginosa Müller (Coleoptera: Chrysomelidae), was released in New Zealand in 2007 as a biocontrol agent against the pasture weed, Cirsium arvense (L.) Scop. The impact of the beetle on shoot population density and spread was assessed over two years on isolated experimental plots within an established population of the weed. Four folivory treatments were imposed by applying 0, 5, 10 or 20 larvae per shoot. Folivory in the 10 and 20 larvae per shoot treatments caused C. arvense population declines of 29% and 75%, respectively, although this effect was not consistent between the two years. Shoot spread was reduced in both years where 10 or 20 larvae per shoot were applied. This study represents the first post-release assessment of this biocontrol agent in New Zealand, and indicates that average densities of ≥ ten larvae per shoot can reduce population density and spread of C. arvense.

Keywords

Cassida rubiginosa Cirsium arvense Cardueae Herbivory Thistle 

Notes

Acknowledgements

This research was funded by Beef + Lamb NZ and the Ministry for Primary Industries, through the Sustainable Farming Fund (Project 401499). Additional support was provided by the AgResearch Strategic Science Investment Fund for Pasture Weed Ecology. We thank Tom Maxwell (Sheep & Beef farmer, Scargill, Canterbury), for allowing the field trial to be carried out on his property, and hosting a field day on thistle biocontrol.

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Copyright information

© International Organization for Biological Control (IOBC) 2018

Authors and Affiliations

  • Michael G. Cripps
    • 1
    Email author
  • Sarah D. Jackman
    • 1
  • Chikako van Koten
    • 1
  1. 1.AgResearch, Lincoln Research CentreLincolnNew Zealand

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