Published on Jan. 10, 2019 at https://www.ifs.tas.gov.au/news/2019/jan/10/cumbungi-control-trial-four-springs-lake-update-january-2019
Before and after shots of the area treated by manual slashing. AAT executive member John Broomby admiring the work.
On Tuesday 8 January 2019, we went with Anglers Alliance Tasmania to Four Springs Lake to see the results of the cumbungi control done in January 2018.
We surveyed the eight sites sprayed last year. At two of the sites, eradication was 100% successful. The remaining six sites have small areas of regrowth. These have been re- treated with low toxicity biactive herbicide.
The highlight was that the largest area, which was treated by manually slashing the stems 150 mm below the water surface in January and March, resulted in 100% eradication.
We will survey all sites again in in January 2020.