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运用生命表方法研究南京地区1981年第二代大螟自然种群动态的结果表明,该代个体死亡主要出现在低龄和老龄幼虫期。就其致死原因而言,低龄期主要是气候因素(暴雨),老龄期则主要是捕食性和寄生性天敌。该代大螟种群的世代存活率为4.99％,种群增长指数为5.43。
The results of using the life table method to study the population dynamics of the second generation Sesamia in China in 1981 showed that the death of this generation mainly occurred in the younger and older larvae. In terms of its causes of death, the low age is mainly a climatic factor (heavy rain), while in aging it is predominantly predatory and parasitic natural enemies. The generations of Sesamia inferens survival rate of 4.99%, population growth index was 5.43.