We purchased a three hectare parcel of land located in the heart of Ipswich in March 2014. The land contains a series of water bodies known as the ‘Coffin Holes’. Without hesitation, we signed up with the Waterways Conservation and Land for Wildlife programs with Ipswich City Council.

Inside this bag is Salvinia along with a colony of Salvinia Weevils, ready to be released into this water body.

Inside this bag is Salvinia along with a colony of Salvinia Weevils, ready to be released into this water body.

Unfortunately, the water body located on the property was heavily infested with Salvinia. Attempts to biologically control the Salvinia were tried with the release of the Salvinia Weevil in April 2014. Unfortunately this proved unsuccessful due to the weather starting to cool as the weevils rely on warmer weather to breed and establish.

A weed contractor was subsequently engaged and the infestation was treated with three separate spray treatments using the herbicide, Reglone, and wetting agent, Agral. The chemical is harmless to aquatic life and did not affect the water quality. This treatment was successful.

Unfortunately, the Salvinia re-infested the water body again in September 2015 and another batch of weevils was released in October 2015. We are currently waiting to see the effects of the weevils and will be happy to report the outcomes. We continue to spot spray Salvinia in other areas of the water body where the weevils are not present.

Leanne Field
Land for Wildlife member, Blackstone, ipswich

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