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Flies 101

Flies are very common pests and are the president of Diptera Brachyuria, and there are about 3,000 species found around the world. Hong Kong people generally regard flies as a symbol of filth and poor hygiene, because flies can transmit more than 100 pathogens, including salmonella, bacterial dermatitis, trachoma, conjunctivitis and typhoid fever.



Female flies can lay 350-900 eggs in their lifetime, and house flies sometimes develop from eggs to adults in as little as six days. Adult house flies usually live for 15-25 days. It usually lays eggs in garbage heaps, overripe or rotting crops, compost, and manure. The fly eggs turn into maggots, then into pupae, and finally into adults. Maggots are creamy in color and have a greasy appearance. When entering the pupal stage, the maggots develop a dark, hard shell, legs and wings.


A common housefly found at home, it is usually grey and has four black stripes on its chest. Houseflies feed on a variety of substances, including human food, animal carcasses, and garbage. Therefore, regular cleaning of household garbage, kitchen waste, and the use of covered trash cans are especially important to reduce the breeding of flies. In addition, flies especially like foods with strong flavors, such as salted fish and fermented bean curd, and attracted flies will enter the home through doors and windows. Or animal feces, so owners with pets should clean up pet feces as soon as possible.


Flies can contaminate food surfaces by spreading disease organisms that they pick up on their legs and mouths. Therefore, it is recommended to throw away the contaminated food and not eat it.


General coping methods:

Recycled lunch boxes should be washed with water or detergent first

The fermented pickled food should be kept sealed and isolated

Clean the vegetable cloth and sponge in the kitchen frequently

Install fly traps

Periodically set up poison bait stations

Direct spraying

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