Draft risk analysis report for the release of Hydrotimetes natans for the biological control of Cabomba caroliniana

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We are conducting a risk analysis for the proposed release of cabomba weevil (Hydrotimetes natans) into Australia. The purpose of this release is to control cabomba (Cabomba caroliniana), an invasive aquatic weed.

The use of exotic biological control agents to control invertebrate pests, weeds and other organisms has been common in Australia for many years. Releasing pathogenic, herbivorous, predatory or parasitic organisms into the Australian environment can have potential “off-target” risks. This means risk to other plants or invertebrate animals not targeted by the biological control agent.

We began this risk analysis in response to an application to release Hydrotimetes natans to control Cabomba caroliniana. The application was submitted by the Commonwealth Scientific and Industrial Research Organisation (CSIRO). The Department of Agriculture, Water and the Environment will not commence an assessment to release a biological control agent unless the target pest species has been approved by an appropriate government body. Cabomba caroliniana was approved as a target for biological control by the former Natural Resource Management Standing Committee (NRMSC) in November 2006.

We have now released a draft report, which:

  • estimates off-target risks and potential consequences of the release
  • evaluates the risk to be Negligible, which achieves Australia’s appropriate level of protection (ALOP)
  • proposes the release of the biological control agent Hydrotimetes natans.

You are invited to provide comments on the draft report. In particular, on the proposal to release Hydrotimetes natans.

Submit your comments by 12 December 2020.

To make a submission:

We will consider all comments before preparing the final report.

We are conducting a risk analysis for the proposed release of cabomba weevil (Hydrotimetes natans) into Australia. The purpose of this release is to control cabomba (Cabomba caroliniana), an invasive aquatic weed.

The use of exotic biological control agents to control invertebrate pests, weeds and other organisms has been common in Australia for many years. Releasing pathogenic, herbivorous, predatory or parasitic organisms into the Australian environment can have potential “off-target” risks. This means risk to other plants or invertebrate animals not targeted by the biological control agent.

We began this risk analysis in response to an application to release Hydrotimetes natans to control Cabomba caroliniana. The application was submitted by the Commonwealth Scientific and Industrial Research Organisation (CSIRO). The Department of Agriculture, Water and the Environment will not commence an assessment to release a biological control agent unless the target pest species has been approved by an appropriate government body. Cabomba caroliniana was approved as a target for biological control by the former Natural Resource Management Standing Committee (NRMSC) in November 2006.

We have now released a draft report, which:

  • estimates off-target risks and potential consequences of the release
  • evaluates the risk to be Negligible, which achieves Australia’s appropriate level of protection (ALOP)
  • proposes the release of the biological control agent Hydrotimetes natans.

You are invited to provide comments on the draft report. In particular, on the proposal to release Hydrotimetes natans.

Submit your comments by 12 December 2020.

To make a submission:

We will consider all comments before preparing the final report.

  • Use this form to draft your feedback or upload your own document. If you are uploading a written submission on behalf of an organisation, it must be on official letterhead.

    You will need to register with us or sign in to provide feedback online.

    Before you make a submission, make sure you have read the Draft risk analysis report for the release of Hydrotimetes natans for the biological control of Cabomba caroliniana.

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