论文部分内容阅读
皱大球蚧是我区严重发生的林业害虫之一。主要为害小叶杨、早柳、白榆、国槐、刺槐、复叶槭、苹果、沙果、桃、杏等林木和果树,尤以白榆和国槐受害最重。此虫繁殖力强,一旦发生,1—2年内就严重成灾,致使树势衰弱,枝梢干枯,甚至整株枯死。如盐池县机械化林场,上万亩榆树防风固沙林全部受害,每10厘米长的枝条上平均有雌虫20头,银川市国槐行道树受害率在95％以上。因此虫为害,严重影响了城市绿化和防风固沙等工作的开展。1979—1980年盐池县林业局及宁夏林科所对此虫曾进行过初步观察,并进行了药剂防治试验,但此虫灾情没有减轻。为此近年来我们在银川地区对此虫的发生规律作了较详细的观察并对其天敌和化防适期进行了一些调查研究,提出其综合防治途径,现介绍于下:
Wrinkles big ball scale is one of the serious forestry pests in our area. The main damage poplar, early willow, elm, Sophora japonica, acacia, Acer palmatum, apple, sand, peach, apricot and other trees and fruit trees, especially the elm and Sophora japonica most affected. This insect fecundity is strong, in the event of 1-2 years of serious disaster, resulting in frail weakness, dry branches, and even the entire dead. For example, mechanized forest farms in Yanchi County have harmed all the windbreak and sand-fixing forests on the 10,000 mu of elm trees. On average, there are 20 females per 10 cm long branch and more than 95% of the trees damaged by locust trees in Yinchuan. Therefore, pest damage, seriously affecting the urban greening and sand fixation and other work carried out. 1979-1980 Yanchi County Forestry Bureau and Ningxia Linke Institute had conducted preliminary observations of this bug, and conducted a chemical control test, but this pest disaster did not ease. In recent years, we have made a more detailed observation on the law of occurrence of this pest in Yinchuan area and conducted some investigations and studies on its natural enemies and the prevention and control of natural enemies. Proposed ways for its comprehensive prevention and control are as follows: