How many times do you do greening maintenance a year?

Green maintenance is mainly applied 3-5 times a year to prevent and control pests and diseases. In the growth process of greening plants, the occurrence of pests and diseases is inevitable. These pests and diseases will threaten the growth and health of plants, so it is necessary to apply pesticides, but not all of them can be killed once or twice, and the frequency of applying pesticides will increase accordingly. In the period of high incidence of diseases and insect pests, it is necessary to increase the number of application to effectively control the spread and spread of diseases and insect pests, so greening and maintenance need to be applied 5-8 times a year.