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Then & Now | The mosquito plague and how Hong Kong fought it with sprays, kerosene, and mosquito nets

  • See a mosquito net in a hotel room now and it’s there for ‘heritage’, but for decades they were a key defence against an annual menace

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When in 1976 villagers in Sha Tau Kok, in Hong Kong’s New Territories slept in the open for fear of an earthquake, they made sure to use tents with mosquito nets. Photo: SCMP

From early spring, swarming miasmas of ever-present, constantly biting mosquitoes are an inescapable fact of Hong Kong life, especially in the New Territories.

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In many locations, early morning and late afternoon outdoor activities become almost unbearable because of these pests, especially during periods of constant high humidity and periodic torrential rainfall.

Seasonal conditions, which vary from year to year, affect the intensity of mosquito breeding and consequent nuisance. Relatively mild winters – increasingly prevalent because of climate change – apparently create optimal conditions for enhanced mosquito proliferation.

Like much else in Hong Kong life, it was ever thus. From literally the first summer of British occupation, in 1841, mosquito nuisance was a well-documented fact in letters, memoirs and early official reports.

Happy Valley, pictured here in 1895, was among the low-lying areas of Hong Kong Island noted early on by British occupiers as being affected by mosquitoes.
Happy Valley, pictured here in 1895, was among the low-lying areas of Hong Kong Island noted early on by British occupiers as being affected by mosquitoes.
Low-lying areas on Hong Kong Island, such as the Wong Nai Chung lowlands (soon renamed Happy Valley) and neighbouring Tai Hang, were immediately noted for these pests, and the blood-borne diseases – malaria and dengue, in particular – that mosquitoes were, by then, believed to help spread.
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