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我省十年来螟害面积年达258万亩(防治面积153.5万亩),每年损失稻谷约四千万斤上下。不少地方螟害近年又明显回升,仍是三化螟最为严重。本文根据个人以往的试验和调查研究,并参阅省内有关地区的螟情资料,结合前人研究结果,来综合分析影响螟虫种群数量变动的主导生态因素,以供同行参考。一种群数量的概念一个生物种能够在其适应的地理范围内生存、繁衍后代,而成为当地生态系中的一个组成成员,必然有它一定的种群数量。表示种群数量通常用相对密度,即一定单位内的个体数。检查螟虫种群数量的方法,多根
Over the past ten years, our province has an annual area of 258 mu mu (control area of 1,535,000 mu) and an annual loss of about 40 million kilograms of paddy. In many places, the stem borer has also obviously rebounded in recent years, and the most serious is the third rice borer. In this paper, according to the previous experiments and investigations, and by referring to the data of the moths in the relevant areas in the province, and combining with the results of previous studies, the dominant ecological factors influencing the population changes of stem borers were comprehensively analyzed for peer reference. A concept of population quantity A living species can survive and multiply in its adapted geographical area and becomes a constituent member of a local ecosystem and must have its own population. The population is usually expressed in relative density, ie, the number of individuals in a given unit. Check the number of stem borer population method, more