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自七十年代以来,我市杨尺蠖为害逐年严重,每年春季郊区、县一些地区的大型杨、榆混交林带叶片常常被食光。据八四年统计,发生面积已达7万多亩,成为本市林业害虫中的主要防治对象。1983年至1985年,我们开展了杨尺蠖核多角体病毒防治杨尺蠖的工作,总防治面积为3587亩,除少数地方因使用浓度过低,防治期掌握不准外,大多数地方防治效果均好。现将使用和防治效果介绍如下:
Since the 1970s, the municipality’s Yangchuowu was severely damaged year by year. The leaves of large-scale poplar and elm mixed forest in some areas of the suburbs and counties in spring are often eaten light. According to statistics in 1984, the area has reached 70,000 mu and has become the main prevention and control target of forestry pests in this Municipality. From 1983 to 1985, we carried out the work of prevention and control of Yangchuang poplar by Polygovirie graminis with a total control area of 3587 mu. Except in a few places, due to the low concentration used and the prevention and control period, the control effect in most of the places it is good. Now use and prevention and treatment effects are as follows: