Kill four pests several times a month.

The frequency of killing four pests usually depends on the species and quantity of pests, as well as environmental and sanitary conditions. Generally speaking, for common pests such as mice, mosquitoes, flies, cockroaches and so on. Killing them 2-3 times a week is a common frequency. If the pest problem is particularly serious, it may be necessary to increase the frequency of killing, such as once or more times a day. If the pest problem is not too serious, you may only need to kill 1-2 times a month.

In addition, disinfection methods, drug use and professional level of disinfection personnel will also affect disinfection frequency. For example, some drugs may take longer to take effect, so they need to be used in advance and maintain a certain concentration.

In short, the frequency of killing the four pests should be determined according to the actual situation, and it can be determined according to local experience and practices. If you are not sure about the specific frequency, you can consult a professional.