It is mainly reflected in the isolation of virus transmission routes, drug production and pest invasion, and the effective reduction of the occurrence and harm of adults. In addition, the good ventilation of the Insect and Security Mesh can also prevent the occurrence of certain bacterial and fungal diseases (such as anthrax) to a certain extent. Canker disease is an infectious disease in citrus planting, which is second only to Huanglong disease. The main routes of infection are wind transmission, rain transmission, human transmission and insect transmission. As a relatively independent space, the Insect and Security Mesh not only effectively reduces the transmission frequency of human beings, but also isolates the main transmission routes for the invasion of toxic and harmful adults, thus greatly reducing the transmission of ulcer viruses.