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小地虎是全国性大害虫,也是我区重要地下害虫,常年均有不同程度的发生,有的年份则发生普遍而严重,是我区玉米、高粱、糜子、马铃薯、胡麻、蔬菜及苗木的一大害虫。近年来,我们结合教学,对其发生、消长趋势和为害情况,作了一些调查研究,现简报如下。一、代数问题 1.全年成虫发生曲线:我们从1973～1977年,每年从3月10日至11月15日用黑光灯对小地虎的发蛾量作了系统诱测,现将各旬发蛾的平均数统计如表1。
Small tiger is a national large pest, but also an important underground pest in our region, perennial have varying degrees of occurrence, and some years are common and serious, is my area corn, sorghum, millet, potato, flax, vegetables and seedlings A big pest. In recent years, we have made some investigations and studies on the teaching, the occurrence, the trend of decline and the damage, and are briefing as follows. An algebra problem 1. The annual adult curve: We from 1973 to 1977, every year from March 10 to November 15 with black light on the small land tiger hair moths were systematically induced, now each The average number of hair moths in Table 1.