Written Reply to Parliamentary Question on Control of Midge Population

1 March 2024

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Written Reply to Parliamentary Question on Control of Midge Population by Ms Grace Fu, Minister for Sustainability and the Environment

Mr Leong Mun Wai: To ask the Minister for Sustainability and the Environment whether an update can be provided on the efficacy of PUB's biomanipulation and other measures to control the midge fly population at Pandan Reservoir.

Answer:

1 PUB has implemented a suite of measures to control midges at Pandan Reservoir. These include removing midge eggs along embankments and floating structures, applying biological larvicide within the reservoir, releasing insectivorous fishes into the reservoir, and fogging around the reservoir dyke and surrounding vegetation. The intensity of these measures is continuously adjusted based on PUB’s monitoring of eggs, larvae and the adult midge population. These mitigation measures have proven to be effective in keeping the midge population low in Pandan Reservoir, with no major midge outbreaks occurring since 2019.