害虫的为害有其一定的途径和规律。我们着重在农林作物上研究害虫的发生规律和防治措施,固然是必需的;进一步研究害虫的来踪去跡,就必须追究害虫的自然发轫地。这对于根治害虫和预防害虫的突然袭击,有其重要意义。作者初步提出 Pest damage has its own ways and laws. It is certainly necessary for us to study the law of occurrence and control of pests in the crops of agriculture and forestry. To further study the tracing of the pests, we must investigate the pest’s natural development. This is of great importance to the radical attack on pests and pest prevention. The author initially proposed