果树蚧壳虫的发生规律及防治方法赵林周占京研究发现，危害我省果树的蚧壳虫主要为球坚蚧和桑白蚧。随着我省林果业的飞速发展，栽植量不断扩大，这两种害虫普遍发生和蔓延。受到球坚蚧侵害的果树，树体衰弱，枝条干枯，果实小，口味淡，外观呈煤污状；受到桑白蚧侵害的果... Occurrence and control methods of fruit scale scale insects Zhao Lin Zhou Zhanjing study found that the scale insects harm fruit trees in our province mainly Kenda ball and mulberry white scale. With the rapid development of forestry and fruit industry in our province, the planting volume has been constantly expanding, and the occurrence and spread of these two kinds of pests are common. The fruit tree infested by the ball scale, the tree is weak, the branches dry, the fruit is small, taste is light, the appearance of coal-like sewage;