Presentation on theme: "Controlling Gunnera tinctoria Where are we today? By: Cristina Armstrong and Bruce Osborne."— Presentation transcript:
Controlling Gunnera tinctoria Where are we today? By: Cristina Armstrong and Bruce Osborne
Background Gunnera tinctoria is an invasive plant to the west of Ireland. Established on Achill Island, possibly over 100 years. Native to Southern regions of South America, similar climatic conditions Large herbaceaous perennial plant growing over 2m tall and with up to 2m wide leaves.
Outline Started in 2006 – Msc at UCD (Control & Mapping) Greenhouse experiments Field experiments Mapping Eradication?
Mapping Using field boundaries as a site: Presence/absence of G. tinctoria marked out. At each site: Percentage cover Stand Type Size (L,M,S) Habitat
Total Area Invaded 4.2 km 2 = 2.9 % 0.69 km 2 = 0.46 % Area = 55 football pitches !!
Rivers and Waterways
Distribution along rivers 15.6%
Roadsides and paths
Distribution along roadsides 30.1%
Distribution within 50 m of buildings 49.2%
Quarries and disturbed land
Possible means of spread Short range dispersal Seed falls near parent plant Long range dispersal Rivers and roadsHabitat corridors Disturbance Birds
Greenhouse Experiments Before After Concentration of RoundUp RoundUp V Garlon Leaf area Recommended concentration Garlon fast-acting Leaf area not significant
Field Experiments 1. 4 x 4 m plots RoundUp Two methods of application: Cut and Paint Cut and Injection 2. 4 x 4 m plots RoundUp V Garlon Timing of application Selective
Results 96%83%61%75% Re-application needed after 2 years!!
When is the best time to apply? Early applications were not successful
How to treat each plant Cut,Inject and Spray
Current Work Eradication on Clare Island Biodiversity Grant (Heritage Council) Mapping Methods used in experiment Island involvement Future monitoring
Conclusions Main habitats invaded: Agricultural land Waterways Roadsides Disturbed land Hypothesised that disturbance is facilitating the spread. Re-application of treatments required Other measures of control (physical, biological)
Acknowledgements Bruce Osborne for his supervision. Javier, Angeles, Noeleen, Ale, Margherita, Mark, Lisa, Michael Bob and John for all their field assistance. Ray for his advice on greenhouse expt. Mayo County Council. - Carmel & Louise in GIS - Deirdre Cunningham Heritage Council – Funding