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刺蛾是果树的主要害虫之一。近年来,我县山楂面积不断扩大,刺蛾在山楂上的危害越来越严重,1990、1991连续两年暴发,已成为阻碍山楂生产的一个主要因素。现将我们近几年的调查情况及所采取的综防措施总结如下: 一、发生危害情况我县发生的刺蛾主要有四种,其中褐刺蛾占55.8％,黄刺蛾占42.7％,扁刺蛾和青刺蛾共占1.5％,据1991年调查,第一代发生较严重的山楂园,平均单株幼虫205头,最高可达356头,受害株100％,不少植株叶片被吃光,果实严重脱落,並降低翌年座果率。绿化树受害最
Soth moths are one of the major pests of fruit trees. In recent years, hawthorn area in my county continues to expand, the hare on the thorn moth more and more serious, 1990,1991 outbreaks for two consecutive years, hawthorn has become a major factor hinder the production. Now we investigate the situation in recent years and the comprehensive precautionary measures taken are summarized as follows: First, the occurrence of hazardous situation in our county there are four main types of moths, of which 55.8% brown septum, yellow thorn moth accounted for 42.7% Flat moths and green moths account for a total of 1.5%. According to a survey conducted in 1991, the first generation occurred more severe hawthorn gardens with an average of 205 larvae per plant, up to 356 heads, and 100% of the affected plants. Eat light, the fruit is severely shed, and reduce the rate of fruit set the following year. Green tree victims most