In the northern mountain area of Huairou District, a pest monitor issued the alarm not long ago on pest occurrence in 26.667 hectares of Chinese pines. That afternoon timely prevention and control was adopted. Calculation says that it retrieved the direct economic loss of RMB1 million. The district grows 1.153 million hectares of Chinese pines or 11.5% of its total forest area. The 400 special pest monitors were installed and each takes care and monitors 26.667 hectares of forest...