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Validating the New Zealand Biocontrol Risk Model for Australia : Systematic surveys for non-target host use

Steel, J., Rahmani, H., Ireson, J., Taylor, D. B. J., Paynter, Q., Selleck, C., Martoni, F. and Kwong, R. (2022) Validating the New Zealand Biocontrol Risk Model for Australia : Systematic surveys for non-target host use. In: 22nd Australasian Weeds Conference, 25 – 29 September 2022, Adelaide, South Australia.



This research aims to determine whether weed biological control agents attack non-target plants that supported some development in host specificity testing. Field surveys were conducted for agents released to control six major Australian weeds: ragwort (Jacobaea vulgaris Gaertn.) English broom (Cytisus scoparius (L.) Link), gorse (Ulex europaeus L.), alligator weed (Alternanthera philoxeroides (Mart.) Griseb.), Montpellier broom (Genista monspessulana (L.) L.A.S.Johnson), and St John’s wort (Hypericum perforatum L.). A total of 10 agents, including mites and insects, previously released for biological control were examined, and host specificity checks were conducted. Overall, 15 potential alternative host plants were examined for agent attack as well as the target plants. All agents are well established in Australia and had been released from 12 to 44 years earlier. There was no evidence that the non-target species included in this survey were able to support full development of the agents, although an incidental finding of non-target host use requires further survey effort.

Item Type:Conference or Workshop Item (Paper)
Business groups:Biosecurity Queensland
Keywords:biological control, non-target, host specificity testing, systematic surveys.
Subjects:Science > Invasive Species > Modelling
Science > Invasive Species > Plants > Biological control
Plant pests and diseases > Weeds, parasitic plants etc
Plant pests and diseases > Plant pathology
Plant pests and diseases > Pest control and treatment of diseases. Plant protection > Organic plant protection. Biological control
Agriculture > By region or country > Australia
Live Archive:18 Jan 2023 01:37
Last Modified:06 Feb 2024 05:06

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