一、在研究工作中发现,应用“经济阈值”(economic thrcshold)和“防治指标”(control threshold)两个术语,指的都是开始进行访治的种群密度。但在具体做法上和依靠经验制定的防治指标有所不同,为了加以区别,当前也有称其为“经济的防治指标”。姜淮章(1979)提出的“有害生物种群经济阈限的通用模式”,对粘虫、红蜘蛛、蚜虫等一类害虫比较适用,但对红铃虫(钻蛀性害虫)要把幼虫量或危害程度计算出来,这一 First, we found in the research work that the terms “economic thrcshold” and “control threshold” are applied to refer to the population density at the beginning of the visit. However, the specific measures and experience-based prevention and control indicators are different. In order to make distinctions, it is also called “economic prevention and control indicators” at present. The general mode of economic threshold of pest population proposed by Jiang Huai-zhang (1979) is more applicable to pests such as armyworm, red spider, aphid and so on. However, the amount of larvae or damage to rhodospirillum Degree calculated, this one