长白蚧(Leucaspis japonica Ckll)分布于浙江、江西、湖南等茶区,为害的时期长,当虫口稠密时,连续为害两年,即造成茶树枝条枯死,严重地影响茶树生存,已成为上述茶区茶树的一种毁灭性害虫。如余杭茶叶试验场建场初期,长白蚧就在老茶园中寄生为害,到1960年已蔓延到个别的新茶园,当时的发生面积为330亩,为害较重的面积仅55亩;1962年发生面积扩大到700亩,重害面积达150多亩;1963年发生面积达1000亩,占总面积的50%, Leucaspis japonica Ckll distributed in Zhejiang, Jiangxi, Hunan and other tea areas, the damage period is long, when the insect population is dense, continuous damage for two years, that is caused by tea tree branches dead, seriously affecting the survival of tea trees, has become the tea area A devastating pest of the tea tree. As early Yuhang tea field set up field trial, Changbai scale parasitic damage in the old tea plantations, to 1960 has spread to individual new tea plantations, when the occurrence of an area of ​​330 acres, more serious damage to the area of ​​only 55 acres occurred in 1962 The area has been expanded to 700 mu and the heavy damage area has reached 150 mu. In 1963, the area has reached 1,000 mu, accounting for 50% of the total area.