经济林害虫发生现状与趋势

选择安徽省28种主栽及名特经济树种为主要对象，经过1988年至1995年8年的调查研究，探明当前各经济树种害虫种类、发生现状与趋势。在28种经济树种上查出害虫1074种，其中危害程度轻微、中等、严重的害虫分别为868种、137种和69种，分别占害虫总数的80.8%、12.8%和6.4%。经济林害虫垂直结构为食叶害虫（626种）>枝梢害虫（290种）>蛀干害虫（78种）>果实害虫（43种）>根部害虫（37种）。害虫总体发生率78.0%，其中危害轻微、中等和严重的发生率分别为41.3%、22.3%和14.4%。分析提出现阶段害虫发生类型。

The Current Situation and Dynamics of Economic Forest Insects

Twenty-eight economic forest tree species in Anhui Province were used to investigate the species,occurrence and dynamics of economic forest insects.The results of 8 years' investigation showed that among 28 tree species, 1074 insect species were found, among which 868 caused serious damage,137 caused medium damage and 69 caused light damage.The vertical structure of economic forest insect was leaf insect (626 species)>branch insect(290 species)>borer insect (78 species)>fruit insect(43 species>root insect (37 species).The occurrence rate of insect was 78.0%,in which the rates of insects causing serious, medium and light damages were 41.3%,22.3% and 14.4% respectively.The occurrence of insect was analyzed and a pattern was put forward.