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小地老虎是一种远距离迁飞害虫。通过对成虫种群消长资料的分析表明,在我国境内的越冬基地,成虫种群具有两次(冬、春季)出现高峰;春季蛾量较高,其消长为典型的先坡后陡型。在一代为害区,成虫种群常有三次出现峰(春、夏、秋季);春季成虫均为迁入蛾,其消长为先陡后坡型;夏季蛾蜂高而蛾期短,消长动态属先坡后陡型。影响成虫种群消长的主要原因为虫源及性质、蛾子迁飞特性、气温与天气等。
Small tiger is a kind of long-distance migratory pests. Based on the analysis of the population growth data of adults, it shows that adult population has two peaks (winter and spring) in the overwintering base in China. In the damaged area of one generation, the adult population often had three peaks (spring, summer and autumn). In spring, all the adults migrated into the moth, and the growth and decline of the adult moths were steep and sloping. In summer, the moths were tall and the moths were short, Steep slope after the slope. The main causes of the growth and decline of adult population were insect source and nature, moth migration characteristics, temperature and weather.