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三化螟的数量变动是个异常复杂的问题,必须通过长期的、艰苦的研究才有希望彻底解决。笔者于1964年在总结历年资料的基础上,试图对部分世代发生数量变动因素的有关问题提出一些看法。由于水平所限,错漏之处请读者指正。 一、三化螟年度消长概况 1957年-1964年新兴县三化螟发生消长规律为:1-3代显著上升,4-5代显著下降。属第3代多发型。历年事实表明,第3-4代之间的数量变动是年中消减的
The change in the quantity of the stem borer (Chilo suppressalis) is an extremely complex issue that must be solved thoroughly through long-term and painstaking research. On the basis of summing up the historical data in 1964, the author tries to put forward some opinions on some issues concerning the factors that cause some changes in the number of generations. Due to the limited level, the wrong place please correct me. First, the annual growth of the three borer Overview 1957 - 1964 Xinxing County, the occurrence of the growth and development of the borer: 1-3 generations significantly increased 4-5 generations significantly decreased. Is the third generation of more hair type. Historical facts show that the change in the number between the 3rd and 4th generations is abated during the middle of the year