杏树林害虫为害与发生规律

为全面了 解杏树林 害虫的 为害与 发生 规 律， 给 防 治提 供依 据， 采用 标 准地 方法 对 不同类型的 杏扁林进 行了系 统调查。 结果表明 ， 杏树林 害虫群 落共有６ 目２５ 科５５ 种， 优势 种集中于蚧虫 、蚜虫、卷 叶蛾等 类群及天 幕毛虫、 舞毒 蛾等 。树 木 年龄 可 影响 害 虫 群落 的 组 成、优势种数 量及危害 程度 。管 理水 平 对 害虫 发 生 有明 显 影响 ， 一 般 管理 水 平高 者， 害 虫 种类 少、危害较轻 。杏树林 害虫的 年发生规 律 是发 生周 期 短、优 势 种高 峰期 出 现早 、为 害期 集 中、群落凋落 迅速。

THE LAWS OF INSECT PEST DAMAGE AND OCCURENCE IN APRICOT TREE STAND

For the sake of finding out the laws of insect pest damage to apricot trees and providing the basis for coutrolling the pest,sample plot method was applied to investigate the apricot tree stands of different type. The results show that the insect community in apricot tree stand have 6 orders, 25 families and 55 species, the dominant species concentrate on the group of scale insect, aphids, budworms and common lackey moth, gypsy moth. Age of the trees have influence on the composition, the number of dominant species and damage degree of insect pest community. And the management level have obvious influence on the occurence of insect pests featuring that there were less species pests and light damage in the well managed stands. The annual laws of insect pest occurence and damage on apricot trees are that the occurence cycle is short, the tip period of dominant species appears early, the damage period is concentratine and the community withers rapidly.