According to the instructions of "Food Hygiene Code" for Pest Control
Pest infestations should be dealt with immediately but without affecting food safety. Preferably, they should be carried out by specialist pest control service providers. Rodenticides and insecticides should be applied in such a manner as not to contaminate foods – they should not be applied while food production / preparation is taking place, and all open foods should be well covered and protected.
In the event of pest infestation, any contaminated equipment, utensils and food contact surfaces should be thoroughly cleaned and sterilized. Any food that has been contaminated by pests or pest control chemicals should be disposed of.
According to the instructions of the "Food Hygiene Code" for Prevention and Control of Pest Infestation
Insect Electrocuting Device (IED) equipped with catch pans can be used to eliminate flying insects in food premises. IED should be placed at least 1.5m (preferably 4.5 – 6 m) away from a food handling area. Only low wall mounted type IED should be used, and ceiling-hung IED should not be used in food handling areas.
According to the instructions of the "Food Hygiene Code" for Premises and Physical Facilities
Junctions between walls, and between walls and ceilings, should be tightly sealed and maintained in good condition, and free from cracks, crevices, holes or gaps or flaking materials. Any holes or gaps that may allow access of pests to wall and ceiling cavities should be sealed up.