经济阈值概念在有害生物综合治理系统中起决策作用。根据美苏有些资料报道~([6、712]),采用经济阈值来限制化学农药的使用,不仅可以节省70—75%的喷药开支,而且大大减少喷药面积和用量。根据定义,经济阈值指“应决定采取防治手段以防有害生物种群上升到经济损害水平时的种群密度”(10)。 The economic threshold concept plays a decision-making role in integrated pest management systems. According to some data from the United States and the Soviet Union ([6,712]), the use of economic thresholds to limit the use of chemical pesticides can not only save 70-75% of the spraying expenses, but also greatly reduce the spraying area and dosage. By definition, an economic threshold means “that a control strategy should be decided to prevent the population density of pests from rising to the level of economic damage” (10).