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棉铃虫是山东棉花上主要害虫,确定历史资料整理标准,分清发生世代和发生程度,使其历史资料标准化、规范化,是提高历史资料应用价值的关健,是提高测报水平,有效运用历史资料的重要措施。棉铃虫,在山东一年发生四代,个别年份有少量的五代幼虫,第一代在小麦等寄主作物上,在棉田危害的主要是二、三、四代,一、二代间,二、三代间世代界限明显,各地发生时间较为集中。三、四代间重叠发生,成虫自7月中旬一直到十月中旬连续不断,见图(1),
The cotton bollworm is the main pest on Shandong cotton. Determining the standards of historical data, distinguishing the generation and degree of occurrence, standardizing and standardizing the historical data, is the key point to improve the application value of historical data. It is to improve the level of the newspaper and make effective use of historical data Important measure Helicoverpa armigera, four generations a year in Shandong, a few years in a small number of fifth-generation larvae, the first generation in the host crops such as wheat, the main harm in the cotton field is the second, third and fourth generation, between the first and second generation, Generations between generations clearly obvious boundaries around time occurs more concentrated. Overlap between the three or four generations, adult from mid-July until mid-October continuous, see Figure (1),