棕肾圆盾蚧防治指标研究*

Abstract

Abstract:

In this paper, the simple linear regression relations between population density of Aonidiella sotetsu (Takahashi) and percentage of withered stick and between percentage of withered stick and damage percentage of trunk firewood, multiple regression relation among covering percentage of crown canopy and annual precipitation and water conservation, multiple regression relation among covering percentage of crown canopy and annual precipitation and soil conservation, simple linear regression relation between covering percentage of crown canopy and water conservation percentage, simple linear regression relation between covering percentage of crown canopy and conservation percentage, critical data of water and soil conservation, critical percentage of crown canopy covering, damage percentage of water and soil conservation, damage percentage of crown canopy covering percentage and trunk firewood were studied.The results showed that the control threshold were 2.59, 15.02 and 27.44 head scale/cm², and at the same time the crown canopy coverings 70%, 80% and 90% respectively.

Key words: Aonidiella sotetsu (Takahashi), Control threshold, Protective forest, Ecological benefit

Jialin Wu,Yongzhi Pan,Qian Zhao,Jixiang Su. STUDIES ON THE CONTROL THRESHOLD OF THE SILK TREE SCALE (AONIDIELLA SOTETSU (Takahashi))[J]. Scientia Silvae Sinicae, 1998, 34(2): 51-57.

Figures/Tables 7

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References 8

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STUDIES ON THE CONTROL THRESHOLD OF THE SILK TREE SCALE (AONIDIELLA SOTETSU (Takahashi))

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