Hong Kong will trial a “mosquito-to-control-mosquito” strategy next year, under which the insect males are infected with bacteria to prevent their offspring from reaching maturity, following the city’s first local dengue fever case in over a year.

Announcing the strategy on Sunday, Director of Food and Environmental Hygiene Donald Ng Man-kit said the government could lower the threshold for stepping up control measures, as the city’s mosquito population rose more rapidly this month.

The first...