论文部分内容阅读
DDT及许多其他有机合成农药,在害虫防治上的巨大效果是人所皆知的,但是果园中由于经常地及单一地使用这些药剂的结果,象苹果蠹蛾及其咀嚼口器严重害虫被压制下去了,但却引起了螨类的大发生,这种现象不论在苏联或在中国以至在世界各地都是一样。 虽然叶螨类分布得很广,而且其为害程度也逐年增大,但是除了其中个别的种类以外,无论在生物学或防治法方面都还很少研究,因此自1956—1958年笔者在苏联学习的时候,曾进行了莫斯科省区苹果园中叶螨(Tetranychus)种类的调查并研究了其中最主要的
The great effects of DDT and many other organic synthetic pesticides in the control of pests are well known, but as a result of the frequent and singular use of these agents in orchards, severe pests such as codling moths and their chewing mouthpieces are suppressed It went on, but it caused a great deal of mites, a phenomenon that is the same both in the Soviet Union and in China and around the world. Although spider mites are widely distributed and their degree of harm increases year by year, the author has studied in the Soviet Union from 1956 to 1958, except for a few species, both in biology and in the field of prevention and treatment , A survey was conducted on the species of Tetranychus in apple orchards in the Moscow Province and the most important